Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1431f9e6f02203…

MALICIOUS

PDF

76.8 KB Created: 2021-03-14 04:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12622a0a220d895008cae51f668f0322 SHA-1: 53484a1bfdb0c42e53eb2513a6d891a7de098266 SHA-256: fc1431f9e6f02203dbeb4737609e72cec48078b495dc22020c56192edb3049ff
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing operation. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=ismb+2020+registration
    • https://cdn.sqhk.co/lanuniwa/yy5ifhe/falivoremizugubu.pdf
    • http://5coupons.info/jowuzujs48y9.pdf
    • https://cdn.sqhk.co/mekizojo/ddGgfC7/my_cloud_wd_4tb_setup.pdf
    • http://goods-amzon.com/kaxivr6119.pdf
    • http://hookup756.fun/53899820051mv6x6.pdf
    • https://cdn.sqhk.co/rasetiwulipu/jfm53ih/exogenous_definition_microbiology.pdf
    • http://mishgen.com/49682610399fb28v.pdf
    • http://alteramaks.world/was_star_trek_beyond_the_last_movienpaya.pdf
    • http://peuer.xyz/ziworutatiraruwvy46k.pdf
    • https://cdn.sqhk.co/dodirijobadi/ghgfgdx/cardboard_cutouts_for_cardinals_games.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_2ff1ad84b13b40578abc1318e4afe85e.pdf?index=true
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_68a4f4c33d854be78a93db2114041a8c.pdf?index=true
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_028ded3f9d004fd7bf1642608084f70b.pdf?index=true
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_020902f648114e299ad1a91523bde1e1.pdf?index=true
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_96699dfe2b064498b675e409bbc59676.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a220efd-f1dd-48b7-94b4-b8fd66078807/mavudukovelilapiboj.pdf
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_d7a9961db85b45f49def96d60c023b49.pdf?index=true
    • https://uploads.strikinglycdn.com/files/048f8206-b424-40f2-bcf1-bf210641f94c/85616481526.pdf
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_6265f53e7e6e4c53b60ccc1aa1ffec9f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfb.bin
2ca7bf88a3fc3d8ad8bce9d613269c837d60823bb2f7db89b2a5226c8cd3e3f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 5324 bytes
font_01_sfnt_off0000fff9.bin
4022ff743545accd8f8db71e623047606b39966e5d119a36a684524a394fb22b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 11312 bytes

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