Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba6830af52e9c73…

MALICIOUS

PDF

75.1 KB Created: 2020-11-10 08:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 691e948b43c9943c0dd7b0a2bf8b464b SHA-1: 7eddb8718311332c27d5c588952861e1a4946e76 SHA-256: cba6830af52e9c7315e24ce710a7389f3f57f4e2c8afcc4f120a4f6d3a3ff09b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the document contains a large number of external links, with the primary URL being https://traffking.ru/aws?keyword=applications+like+google+docs. This suggests the document's purpose is to redirect users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/aws?keyword=applications+like+google+docs
    • https://pemibala.weebly.com/uploads/1/3/4/6/134620411/jukufafovejofum.pdf
    • https://gedobelega.weebly.com/uploads/1/3/4/3/134375191/vuzowonoxuvebat.pdf
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5f88ecafb36d9.pdf
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/gubewasusa.pdf
    • https://cdn-cms.f-static.net/uploads/4385636/normal_5f91cb17485cf.pdf
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/97b509ec8e482ac.pdf
    • https://cdn-cms.f-static.net/uploads/4380084/normal_5fa87c785d35d.pdf
    • https://cdn-cms.f-static.net/uploads/4386607/normal_5f9fd29f3553f.pdf
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5f8f8ce0b13b2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1a57e150-0866-40bf-be69-dd8611abc2ef/pizimabazotobirufo.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/navimozamafisefalov.pdf
    • https://s3.amazonaws.com/debiwelof/83031991500.pdf
    • https://s3.amazonaws.com/ribowexulo/bragg_law_and_its_application.pdf
    • https://s3.amazonaws.com/xanebavifamopez/juwikimezam.pdf
    • https://s3.amazonaws.com/wegugus/59648412369.pdf
    • https://s3.amazonaws.com/fakuguvil/rebobak.pdf
    • https://s3.amazonaws.com/befevifa/26537519313.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f3.bin
ee969525821f08091d37631cfb50dd4c43437476cec67273698fb9ab0a79077d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 5200 bytes
font_01_sfnt_off0000fab8.bin
65a2f2c16b404fb8fedb426a67383d1b2275ca7fb8ab9f1b4ce86aafbb126f4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 10824 bytes