Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a990150a2d398e4…

MALICIOUS

PDF

78.8 KB Created: 2021-05-29 08:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 54110999b16c3ad53369a9bdfbd34e8a SHA-1: 2ea62e02e5ad54088e430f5309dcaf6e7b3d7496 SHA-256: 3a990150a2d398e4507664210e480e9735ac5426db0dd30d9cba1852f3ebd8e8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/123?utm_term=adobe+reader+for+pc+windows+8 PDF link annotation
    • https://jijibeworazari.weebly.com/uploads/1/3/7/5/137515782/betet_segowu_gediwotave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_604ee8604770a.pdfIn PDF document text
    • https://dotodologeviron.weebly.com/uploads/1/3/4/5/134513902/1885efd4.pdfIn PDF document text
    • https://pevumufaropis.weebly.com/uploads/1/3/4/7/134706438/lugefi_nabij_wanakonekojajib_sikadub.pdfIn PDF document text
    • https://rukixuxasob.weebly.com/uploads/1/3/4/7/134703890/jifozezobare-dabuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_6024b4f3c448a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388160/normal_602b7d7204fb9.pdfIn PDF document text
    • https://satatemusuk.weebly.com/uploads/1/3/4/3/134311800/c560b69de7ba3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_603149ab26840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_604f2d1634ee5.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/f19892478e.pdfIn PDF document text
    • https://vekupaju.weebly.com/uploads/1/3/4/4/134479754/4533906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_601cb88f12dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_600d8c4547f1c.pdfIn PDF document text
    • https://xomowapiwaliv.weebly.com/uploads/1/3/4/0/134000086/divis-buriwamejumukek-dapuxumoxevu.pdfIn PDF document text
    • https://mabiredozex.weebly.com/uploads/1/3/4/4/134482212/natenolulaka_faxobilibewivis.pdfIn PDF document text
    • https://mefivezetu.weebly.com/uploads/1/3/2/6/132681021/liwanelaxopako_bakakoxe_jefufujum_xabofopezag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392439/normal_5ffcd2a50c502.pdfIn PDF document text
    • https://bizonununifewe.weebly.com/uploads/1/3/4/7/134773553/110530fd664.pdfIn PDF document text
    • https://pabenegoje.weebly.com/uploads/1/3/4/3/134348732/028ce157d38b73d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_60291a1b8b8dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_605c47514991e.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/ec7c401e-8e40-4937-9c3e-9fd95d1702a6/vetemiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b44a4f4b-8889-4abf-affe-627f9fea9ee6/kewibejuziliwitusuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040b3e28-e055-4940-89c5-a868918d1427/11288651777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb5b037-8c74-4a05-bf74-0ad44327826a/bolens_2028_parts_list.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_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 5532 bytes
SHA-256: 644567c818406812623dca0305cbb94502c43a94c2ec646ebd23871605e49356
font_01_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 11588 bytes
SHA-256: 3cfe295bb5bd04d5f6387a31b4e4bf05eb74ed5ff4b82e8ef6e5c466473fdefb