Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4901642395c953…

MALICIOUS

PDF

76.6 KB Created: 2021-02-26 13:38:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 9663737460aca77d475e277c6884c2f6 SHA-1: e055005bae0ae057bb95d8438c44ef6ccccb68f7 SHA-256: da4901642395c953db9b53a6956bae0093dd839d88952971b76d8ecbeba50d64
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a site that appears to be part of a link farm designed to attract traffic. ClamAV and ML classifiers indicate maliciousness, specifically flagging it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

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/wix?keyword=mendelian+genetics+video+review+sheet+answer+key PDF link annotation
    • http://copyrightsupporteds.com/introduction_to_machine_learning_with_python_andreas_mueller_free_downloadphsd3.pdfIn PDF document text
    • http://rentline.pro/sinexanewunrnxq8.pdfIn PDF document text
    • https://jafekubu.weebly.com/uploads/1/3/0/8/130814731/vubigur_lomagajinag_velemirare.pdfIn PDF document text
    • https://cdn.sqhk.co/zedozomi/ijhj3jd/90102784053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_5ffeb8decf4e4.pdfIn PDF document text
    • http://hhizmet.com/xakigurumetiwowomoksomz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470679/normal_601eb68f8710e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_600e13726bb03.pdfIn PDF document text
    • https://cdn.sqhk.co/doginifa/2Kgge9J/jezexomawixomemikupur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_6009bce3d15ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/33065591236.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/madness_retaliation_labyrinth_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/chitralahari_prema_vennela_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/appserver_64_bits.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/nexa_bold_regular_font.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/82351815734.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 5524 bytes
SHA-256: 68f47807dc740a3a0c4af7996e51adc8948dc329c3a7ae1a58161298ad93c938
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 10136 bytes
SHA-256: 19f2effd53566fb860d13dd546dc80955114dec1e0184ac6af70b50f737d1889

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