Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a2b3c2ce04e9de…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 16:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35dbeec50d69e0d2ca38697f91ea3a9b SHA-1: 67db344ca50b97d904b8b10fbb034d01e68b8f77 SHA-256: a4a2b3c2ce04e9de95bb78bc5e461ca1a8ffa152eaa757227d30d6893d362c7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=founder+of+android+phone PDF link annotation
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/75527253934.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/94569736686.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/upj82r4fjqbnucj0f10qar7v61/73321276797.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/kubalogifali.pdfIn PDF document text
    • https://ferropula.hr/files/mewigiv.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/xovidajidusaxugame.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/fosovunasidunudizobi.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/ketugurarudaku.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/22768167585.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/tapapep.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/28699031253.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/mikerisena.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/xogogulaxigavigusu.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/16029636534.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec7a5628f6---bemobikomivumizoxuf.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/sozajejobisaworinepa.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/59000120908.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/jowoneb.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://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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 10360 bytes
SHA-256: e617e6cb81b7716a5b859588bffb43541b6662258c78e56590d7b18c834411e6
font_02_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 17916 bytes
SHA-256: ca4c244c141d17178194ca838dc6a3f5bc95cd5d5ba2bce2a4f2a3825e9365d9

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