Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a494019cf0e76df…

MALICIOUS

PDF

69.7 KB Created: 2020-11-12 17:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 654995078db3e1c3a2094b438e6f0381 SHA-1: 5395e887d1ce6ddc4c8fa96ac04af41ecf2bdba2 SHA-256: 4a494019cf0e76df415b18b35cacc0969b6e7105dcb38e119d94dfe97021fd94
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a significant number of external links, with one pointing to 'traffking.ru', suggesting a phishing or SEO spam campaign. The presence of embedded PDF objects and the authoring application 'wkhtmltopdf' indicate it was likely generated programmatically to host these links.

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://traffking.ru/123?utm_term=ser+flexibles+para+ser+feliz
    • https://movidotibapokab.weebly.com/uploads/1/3/4/2/134265591/zupokekud-lepotu-vajifiput.pdf
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5f8946b83b2ca.pdf
    • https://jifejajazarig.weebly.com/uploads/1/3/4/3/134307839/sisemirejow.pdf
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/popefejudobus.pdf
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/0878407e7.pdf
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/zupebowelupepavetin.pdf
    • https://gowokijisamupu.weebly.com/uploads/1/3/4/4/134438950/pisinuforu_rakidili_zeguf_mofuxa.pdf
    • https://cdn-cms.f-static.net/uploads/4419451/normal_5fa82c23e0fec.pdf
    • https://cdn-cms.f-static.net/uploads/4393204/normal_5f9b24dd95ed8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vibuvomomuv/carcinoma_de_celulas_escamosas_en_animales.pdf
    • https://s3.amazonaws.com/neviwove/97476080091.pdf
    • https://s3.amazonaws.com/bejokazemur/fuji_finepix_s8630_manual.pdf
    • https://s3.amazonaws.com/buxoparadazegu/is_mary_had_a_little_lamb_a_christian_song.pdf
    • https://s3.amazonaws.com/juvuraguvutoxif/john_deere_l120_manuals_free.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_off0000cb4f.bin
50ad29c29d830d74c467bea5b9739d7837a654f672a666d37a96773817f677c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4F 5256 bytes
font_01_sfnt_off0000dd3d.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 1800 bytes
font_02_sfnt_off0000e5ca.bin
dff68af466a34e7c00debce675371580d263de0392c9478eea3cbd72aa20eb60
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 10660 bytes