Malicious PDF — malware analysis report

Static analysis result for SHA-256 d779c4f5ccec2887…

MALICIOUS

PDF

75.6 KB Created: 2021-02-14 23:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3955e4abfd6edff14fcefb288c6442ab SHA-1: 56e7cc92f9d4d2185de5df62086345b75afd60f4 SHA-256: d779c4f5ccec2887bb2eaa53274c69bdb1350d381a7769baf321340f9fe7ca19
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to PDF files hosted on link farm domains, suggesting a SEO-based distribution tactic. One of the primary URLs, 'https://seumenha.ru/wb?keyword=composite%20functions%20examples%20answer%20key', is presented as a search result, likely to trick users into downloading malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://seumenha.ru/wb?keyword=composite%20functions%20examples%20answer%20key PDF link annotation
    • https://tisuzozolida.weebly.com/uploads/1/3/6/0/136087901/wadatozodol.pdfIn PDF document text
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/jemotot.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/AMhaqlJ/guideline_401k_rollover.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455375/normal_6012c864730e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370268/normal_5fef870832c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_6014e358b5467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461786/normal_5ff402f872ae0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387932/normal_5ff8fea5c0253.pdfIn PDF document text
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/dajojuk_kositorupi_befaniginupu_botiroge.pdfIn PDF document text
    • https://liziwozubol.weebly.com/uploads/1/3/4/8/134851467/ba28e1aa97c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5fec8f1ed3779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fd3b33672d4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480891/normal_6008902b4b184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497359/normal_600387b959eb2.pdfIn PDF document text
    • http://xikimifo.66ghz.com/factoring_practice_worksheet_answer_key.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vowatul.rf.gd/68703515637.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_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 5392 bytes
SHA-256: 5918b10c0590fbe20d1de9fa7833931793c64f8515d6d47d244ca672fab02edd
font_01_sfnt_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 11856 bytes
SHA-256: 4145d095a1be08514bf32abb76aa9123ae1cdf22cdd2eb652458b0d63c446c67
font_02_sfnt_off00010bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 16152 bytes
SHA-256: 9dd161ad083bde31f1785977080a21cd00ffd1d65af7312c0685ba069ea0c2ef

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