Malicious PDF — malware analysis report

Static analysis result for SHA-256 5709ef9555655b1c…

MALICIOUS

PDF

73.6 KB Created: 2020-12-19 00:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7c652595d7109f5be0f2fe02087b411e SHA-1: 3de7be1893bb074b8ecd74d67722e19c88dc1c12 SHA-256: 5709ef9555655b1cab4aed77bab065aea3718102ea9a426236654b102266ee03
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDFs, suggesting a link farm or spam campaign. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

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://trafftec.ru/aws?utm_term=boorse+health+as+a+theoretical+concept+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468553/normal_5fd2285852be7.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/gisilolozelid_wurerowipapawiw_kowudakexifazi_fepegekob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482848/normal_5fd994e0b4c09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5fa906fa68f83.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/wuzozunokote-kufuwefesuzevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f909949c5aec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f8834e73e3ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_5f8a2d52bcd7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381751/normal_5fc91add81612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f880a1d0841c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f15968-22ee-49a2-a5df-b242f45b4e88/suloworas.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b7d9c89b935f15e3f851/t/5fceb0d96d8d5c7d4798488b/1607381213808/73292422074.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/93077362183.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/risibadujexokusoloxatek.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_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 5292 bytes
SHA-256: fa0419e68eb56c366571bb4bc26f36e808553fc1e3120d051ac142f276f479d9
font_01_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 10188 bytes
SHA-256: c993f9d973b2482a680159c146cc1bc8e0b42ce62d65b02fc5e661e9395fb6d9

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