Malicious PDF — malware analysis report

Static analysis result for SHA-256 c778bea47b5cebb6…

MALICIOUS

PDF

88.3 KB Created: 2021-04-05 14:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 375beb96fd2969e5d83605da75f70cba SHA-1: 038ef1ed786152adeb593afb25986eb0e76632a2 SHA-256: c778bea47b5cebb68782bd94f3a9ca8635c55c69e56d0723ba1f2cc0813ffa7e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this behavior. While no scripts were explicitly extracted, the presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' suggest malicious intent, likely involving phishing or the distribution of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/123?utm_term=latest+south+african+constitution+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevusajilitum.rf.gd/breakout_kings_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0977e69-02b2-459f-a69f-add6cb7c753c/schwinn_hybrid_bikes_walmart.pdfIn PDF document text
    • http://barirenuvekesup.epizy.com/cdc_vaccine_ingredient_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1dfc2d8-6bf0-42ac-b622-14e7e3ad9bd2/84895457034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f62cb0-d4a1-4c99-98d0-e93e6a35c433/what_year_did_class_of_2016_start_high_school.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_d2b88be208844b1984aebd0a37979773.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/what_is_indirect_development_class_11.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_ae6b89b8cac7469d8b2a32279ae048a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f5d0de-bf51-4ff0-8927-4192a5219cbb/7694003569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a9e80e-8aa6-4e30-9828-511385445f45/nimituwukazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/038fbd4b-ea87-49b3-85bb-359aa66c9096/22110948187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/316dbe67-e020-4e60-a272-55e4dbaab8c2/around_the_world_in_80_days_full_movie_in_english_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e4a93b-93e0-42db-8eba-2ffe89eaead8/nikon_d5100_charge_battery_in_camera.pdfIn PDF document text
    • http://lefamuredemupi.epizy.com/samsung_ml-2165w_drivers_free_download.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_579c438b952e4662b2d29d7b3b66b07c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bc8554-5581-4286-9e14-4e8fbf432f51/sakazazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aefb1f17-c1d4-4ca8-bac5-9089ec0a7686/59287218036.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/how_does_world_war_z_multiplayer_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/866f8e7e-4cad-4ce3-ab5e-376d36b55503/nolepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60177566-76ce-41f4-9407-59e450fd65a9/kiffe_kiffe_demain_doria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f4dc5d-8a2a-48a4-88f4-ec716148bf4f/pagugewapediresazijugog.pdfIn PDF document text
    • http://vetuvawefaxuta.rf.gd/imagemagick_convert_to_tiff_black_and_white.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 5152 bytes
SHA-256: b9e33d8906da3f9c2591f93b83ff2710910a3941d49e07df97ffb06865cd0d8f
font_01_sfnt_off00012e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E81 11088 bytes
SHA-256: 3aa600c39ae8113249db826490eda5735617970b762bfcaac239c4aedb8b7070

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