Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7344b6e9b18c832…

MALICIOUS

PDF

91.2 KB Created: 2021-05-22 13:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5ea11e3eb5d4e3c1b3c1eb95f2768ddc SHA-1: da986a6ef08c15d449b2cc92ee586d6c00e18b1a SHA-256: d7344b6e9b18c83219a1f3ccff703b896e2d8d91b26606747aa0ad81f3361a52
136 Risk Score

Malware Insights

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

The PDF file contains an embedded URI and a heuristic firing indicating a redirector link, specifically for 'free-download phishing'. The primary malicious URL identified is https://xezojetit.ru/strik?utm_term=god+is+big+enough+rubber+bracelet. While no scripts were explicitly extracted, the PDF structure and the nature of the redirect suggest an attempt to lure the user to a malicious site, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=god+is+big+enough+rubber+bracelet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462974/normal_602ec64e9daa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_6041e9ba32570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_5fd63c7074f3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493905/normal_5fc6c896ab328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449192/normal_606e8e9fb8634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5fd86344abd7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5ff711c1a7e19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88d917f-b32b-4ed3-83f4-6c9723f805ea/rodunolutagomopenejak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e28e44f-e7c8-4959-b40a-8a0c1d20be44/active_and_passive_voice_exercise_for_class_8_icse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f69dafd-8c88-49f7-83e7-6b11fb679044/49099989246.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/pojukajarisabaxexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e546b906-0df5-4bf8-a8bc-2e03b0316438/99229120619.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/psychological_testing_report_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119ecd7e-729c-42ea-b234-10b9a4beeb29/the_fiery_heart_bloodlines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/979e6463-e1b4-457a-8123-7d4fcbfaac6a/bring_out_game_meaning_phrasal_verb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b49b2e-14cc-4e08-bc8c-69ad465e1372/subway_surfers_hile_apk_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a4875eb-bd14-46bd-86f9-5b471fe643ce/what_does_the_word_tempest_mean_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08a16ede-16e9-4999-abdc-ef21a01103ac/48553155168.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/photoshop_backgrounds_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464fd2ab-a6e2-4c6c-9051-c17870221bc1/5120803997.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/zupedajewuzaximunu.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 5372 bytes
SHA-256: 4a2ab4a55942b2d85a500805ece1e3fa7b043a853ba11a40fd21399aecf3f59c
font_01_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 11036 bytes
SHA-256: 2cec90c1532dfea221351c1f5d0a6d77cf8bc851fc663f4f5894edba72dcc0d9
font_02_sfnt_off000147e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E9 16164 bytes
SHA-256: 4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06