Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c9320cb0335208…

MALICIOUS

PDF

68.8 KB Created: 2021-10-02 17:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f6b36c1747c15a3f6057bb6ebdbf9882 SHA-1: 07ea46f19567a2c7744305c6bb59836843729142 SHA-256: 80c9320cb03352087667b3174b95e1fa782bf9fc849c3d23adc8e8b10ba3f7e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the document's purpose is to manipulate search results or distribute further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 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://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c2c9794a1ee34a5ae8bb6242915980e7/37278179401.pdf In PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/gizakobaforukenojazig.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/49513538813.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/lanalinobaxotobemavosuwan.pdfIn PDF document text
    • http://protok.pro/upload/files/38108460601.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/87675534038.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/92390925085.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/85652120085.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/50734730127.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/61546649412.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/37413552875.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/19410058161.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/79243961716.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/kigadixonipetuv.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/58885017544.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/xuwezaravujobov.pdfIn PDF document text
    • http://methese.com/upload/files/vawufekulibemo.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631839842.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/kuzubumosuwigegidufotafa.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/fawex.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/kutopefusiz.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///guripe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+android+idle+games+2021PDF link annotation
    • 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://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_off0000ac8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49E 15580 bytes
SHA-256: 710b982dee6fbe87e7581f59c7ce1496026d8e9b60b4ae3d188133e709d33a42
font_02_sfnt_off0000ec97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 10940 bytes
SHA-256: 096566a7c5ff6aaa186ad6e685e31cea981ae374b2bd2c3da5778b2dab53aa8c

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