Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ea7d27221df616…

MALICIOUS

PDF

66.6 KB Created: 2021-02-13 00:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a443220c5f9329953472bb92d1b16c43 SHA-1: e62620ff2fdb139bad4f0ee30efb7fac5e3f2b98 SHA-256: e3ea7d27221df616f6e91d6ac1f5b4771508a4db580290c617a861aaf6455d70
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating it functions as a link farm. Numerous external URLs are embedded within the PDF, suggesting a primary purpose of redirecting users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=constructing+triangles+worksheet+ks3
    • http://befigter.xyz/oraciones_first_conditional0dlaz.pdf
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/9458430.pdf
    • https://linerebe.weebly.com/uploads/1/3/0/8/130813546/35a6d25f13228b.pdf
    • http://fastpysystem.online/pemobuzizugapewekh0qq8.pdf
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/bubumuw-tamafegeguluzux-belikajokudirup.pdf
    • http://shopee24.site/16198932081ormai.pdf
    • https://fujovufizopi.weebly.com/uploads/1/3/2/7/132710671/1570530.pdf
    • https://tupeduwexawagov.weebly.com/uploads/1/3/1/6/131607208/4135702.pdf
    • https://pixelisikug.weebly.com/uploads/1/3/1/4/131407736/guboxovaba-vapebobabu-kafaxoxefofode-debolesepufere.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gesasodalunaka.epizy.com/soccer_manager_mod_apk.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/17168239485.pdf
    • http://jovesupegomiz.epizy.com/pikojubikezupa.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ab.bin
a4cda89af2a92cb109e2904a308590f2ff7ea27b40cbb5760bdbacc43c490e96
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AB 5284 bytes
font_01_sfnt_off0000c6b1.bin
a91c58bf59d0ded6ecf67a2a613cf28c205e48311402d5f3a361058ccff88148
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B1 9992 bytes
font_02_sfnt_off0000e8f2.bin
4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 16072 bytes