Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef68b560456915d…

MALICIOUS

PDF

91.9 KB Created: 2021-05-08 21:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 649e17cbf0ff27f45f57b6a79ad7ec92 SHA-1: 9f1256c70ec4e5965ecaafc555eaeb617c603413 SHA-256: 5ef68b560456915d30d2f6e96d9aad17f299932a230c23182bca9aff73c35578
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a lure related to a 'social security bonus trick' and includes a link to a suspicious URL, jottigo.ru, which is flagged as an SEO redirector for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or delivering a second-stage payload. No scripts were extracted, but the PDF structure and embedded URI point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/strik?utm_term=what+is+the+social+security+bonus+trick PDF link annotation
    • https://cdn.sqhk.co/bemaxopig/bih0zid/93438444670.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/hj4VCz0/votafizufuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/125d2207-83ac-4565-97e5-80e62f36d079/45295397656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4cd9c15-4cb3-4fd5-9a31-71423a42f059/63375319429.pdfIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_fb1d151bb6994aa597fce2e10082adb6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51591bd8-5d9a-4062-b6a7-03dd3228a84d/51142974523.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_28c2dae674594d1e8b30f7e7988c440b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5abffda-b48b-463c-9b25-bd02e98ad761/14325720431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f8ede38-9bb1-4dbb-8d12-5f62bd9a8f37/67418154322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7957cc48-614c-4a40-ae6a-17bb4052ba7e/23841780156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d3f9047-0c6d-4acc-9e80-c589a3c3d316/5th_grade_summary_writing_samples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e85223e6-938b-4ede-9eaf-c2fc9dafa4a4/unix_and_linux_system_administration_handbook_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88611b2-74d5-480e-9dcd-ce09d318fd88/que_significa_soar_con_que_se_caen_los_dientes_de_abajo.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_497ede973469455ebb68b5f1cfe7b65c.pdf?index=trueIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_bc50f830d1c944c2889c765e24a3677d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2436b9-e19c-4091-a439-a5e3e5c5c31c/how_to_put_a_belt_on_a_kenmore_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c913b165-4600-4bcc-a913-17cd72c14db3/vajomavokogalenel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/789056d7-e0fe-4278-aaba-8a83e7b0dd7e/vepekafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77b6eae-2477-4e6c-ac2b-0fc3d848b7c9/87351871536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7ad882-287e-4178-8c23-52131add18a2/80317490284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c5966f5-e76c-4b01-8ee4-f71d00270c64/simple_stories_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7f34fa-9696-4466-93bc-b29ff8843b61/harry_potter_deathly_hallows_2_full_cast.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_240cd2c087f14df989b779a7e63d3eba.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 5088 bytes
SHA-256: 8d16f3ca0176db3a408610079390b11bc4d970d7e6c5f58ab4e33bb9268c6c2f
font_01_sfnt_off00012cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD2 11480 bytes
SHA-256: cd507696330635385d110316338814962373db92f845231ba19d04fce033998d
font_02_sfnt_off00015389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15389 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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