Malicious PDF — malware analysis report

Static analysis result for SHA-256 6877a5c77577ba97…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 10:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58668cdfc6f8f61d350f96e93ee5f23d SHA-1: 2b2e340917ba6b9533cc70e6d6123fac13234a5b SHA-256: 6877a5c77577ba97ad0adf6a484e3be4cfc2b2fe56d8ff75bdeec9743f0d50c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, and the presence of external URIs further supports this. While no scripts were explicitly extracted, the nature of the embedded links suggests the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=android+starting+optimizing+app+1+of+1 PDF link annotation
    • https://edex.co/userfiles/files/56510695684.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/1605717563.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210911194702.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/20654071304.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/99671524781.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/36796557941.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/4264796332.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/52604188998.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/76818551863.pdfIn PDF document text
    • http://checopharma.com/upload/files/ketaloburezorabab.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/muxabikag.pdfIn PDF document text
    • http://change4best.ru/upload/file/zukan.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/64533202055.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/67366676526.pdfIn PDF document text
    • http://getvisa.ru/images/File/miwudedadizabekujetup.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumikene.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/garikepivibop.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/10750127885.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/pujep.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/75073966342.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/18615606212.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/sejigumamuwudika.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/pafujiligoka.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_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 17648 bytes
SHA-256: f3a8ed5579056f746eb46bf57d8180bfc28354d13ee22ac767ac8e94c8d7b52b
font_01_sfnt_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 10756 bytes
SHA-256: 6f193df8c1e857d65714b90b323ce22b786a430ee912a5224200b45b395f6a32
font_02_sfnt_off0001322d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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