Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5951e33271e85ce…

MALICIOUS

PDF

59.9 KB Created: 2020-11-21 06:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4530a7e44f3120d675c92f24eb90efce SHA-1: 6955775eefd83ecaa41bcb100305eb768324be15 SHA-256: d5951e33271e85ce433349b673d45d1f2e26f4291715936b02f90d347482686c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The embedded URLs likely serve as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/123?utm_term=tang+dynasty+clothing+for+sale
    • https://cdn-cms.f-static.net/uploads/4392652/normal_5f9f3e8b1d20f.pdf
    • https://cdn-cms.f-static.net/uploads/4415767/normal_5f959eade09a7.pdf
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/kapavogefogep_nilavugezabo_gakodidajapore.pdf
    • https://cdn-cms.f-static.net/uploads/4407064/normal_5fb6ebfe43dc5.pdf
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f87504c29eff.pdf
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/vapemar-kivokukazo-gegokotusega.pdf
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f891f9a28653.pdf
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fb2cf3156d98.pdf
    • https://cdn-cms.f-static.net/uploads/4417037/normal_5f9f6e507e363.pdf
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f8ff239cbd8f.pdf
    • https://dexoxewivovevub.weebly.com/uploads/1/3/4/3/134322619/safuxeku-sinek-supukijupep-sotoluv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wumodukubaru/creative_bets_for_couples.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_off0000af98.bin
1c9a118450421dca29f9981f7cf0575b76921c728c61ea6accf9deffae1e8190
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF98 5336 bytes
font_01_sfnt_off0000c1bb.bin
0e445e5374216255bfd09dbad4506c4a8384f3195cc8f0ab4b6243980b57dfb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BB 9780 bytes