Malicious PDF — malware analysis report

Static analysis result for SHA-256 a542a9574f4dc56d…

MALICIOUS

PDF

75.9 KB Created: 2020-11-24 15:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5cf5a54c62ca78c5aaebdb0bd30ce76 SHA-1: 18c50f96aa868ecc7edf4c248ecbf8659447f3de SHA-256: a542a9574f4dc56d7523ad92536cb68e5663e1b0ce0702da448f3c1b883740ee
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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://traffset.ru/strik?utm_term=resident+evil+outbreak+file+2+wild+things
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/a1676f7d42d0f.pdf
    • https://lofizalu.weebly.com/uploads/1/3/4/6/134601384/xizikuganexadax-nedesewisev.pdf
    • https://cdn-cms.f-static.net/uploads/4409238/normal_5f9d0444788d0.pdf
    • https://cdn-cms.f-static.net/uploads/4465386/normal_5fb309be3680a.pdf
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5fb9c9249c91b.pdf
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/kexip.pdf
    • https://pinowutofabu.weebly.com/uploads/1/3/4/7/134763632/pabidemubexetulu.pdf
    • https://cdn-cms.f-static.net/uploads/4456165/normal_5fab50e9a4793.pdf
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5f8cc0c9f3f6c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gapivegek/kivowisixogonezex.pdf
    • https://s3.amazonaws.com/gifojuxaxeva/ns_railroad_train_symbols.pdf
    • https://s3.amazonaws.com/pukaridimupo/vawelesegasirozodon.pdf
    • https://s3.amazonaws.com/zedudo/90698657047.pdf
    • https://s3.amazonaws.com/ribowexulo/wizibebilimaf.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da63.bin
3fbd1f3ae26cd2ee20bc1f665eb7ce6f11dd9e1ef9f242d86a38ce60610e8715
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 4516 bytes
font_01_sfnt_off0000e9fa.bin
fa987df527ef9f2733a0e5f72ce668faa55086a5f03a39cb087aa50f6d3e9d90
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 5664 bytes
font_02_sfnt_off0000fd5b.bin
e89beee5a2c4a5a4a40b9b09b3d03dbf9f0268704080320cdaeab3cb0e327ae0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 10660 bytes