Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac99c79963146cf…

MALICIOUS

PDF

113.2 KB Created: 2020-11-28 09:18:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 030c0f081bf012f3fd06c4824b933a84 SHA-1: 19baee69841afd5ff94577d9e1866b5a576ecfa7 SHA-256: eac99c79963146cf3633b043fcdd5499053d242731fc9d718a96a22ce27b135d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various PDF files, likely serving as lures or further stages of infection.

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://trafficel.ru/aws?utm_term=inhibitors+of+oxidative+phosphorylation+worksheet
    • https://cdn-cms.f-static.net/uploads/4446286/normal_5fc0184b814ff.pdf
    • https://zixatemanareku.weebly.com/uploads/1/3/4/4/134472678/3b443bef6428.pdf
    • https://cdn-cms.f-static.net/uploads/4447098/normal_5f9f6548ba7f6.pdf
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5fb87ae69e23a.pdf
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5fc075270ccf6.pdf
    • https://cdn-cms.f-static.net/uploads/4477658/normal_5fa8ab17b1ee0.pdf
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f874d4b8ea8f.pdf
    • https://jokepalebaja.weebly.com/uploads/1/3/4/3/134360350/bagewuf-weliziwerifazep-suvom.pdf
    • https://cdn-cms.f-static.net/uploads/4389074/normal_5fb74ac09b60b.pdf
    • https://cdn-cms.f-static.net/uploads/4412908/normal_5fa35e979553b.pdf
    • https://cdn-cms.f-static.net/uploads/4468540/normal_5fb4145e07c96.pdf
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5fbb4b69e0e55.pdf
    • https://cdn-cms.f-static.net/uploads/4455374/normal_5fad5e5216665.pdf
    • https://cdn-cms.f-static.net/uploads/4465255/normal_5fa89db1db42d.pdf
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/64162d6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jusuberu/16269043756.pdf
    • https://s3.amazonaws.com/fowikorejodi/parent_portal_login_hays_cisd.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_off00017df8.bin
8d8507c9a7353e136c7e252c070829eaf9c5b7225bfff2948ae8615b7d1c2c9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF8 5592 bytes
font_01_sfnt_off0001910e.bin
348966b8b23acab611785cf82e6435173d8735c2a47c9758e7b52e83fca78cd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1910E 11164 bytes