Malicious PDF — malware analysis report

Static analysis result for SHA-256 32330f2d52ea5ec4…

MALICIOUS

PDF

75.1 KB Created: 2021-06-03 20:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 02016b9e6401fff0a0e7ca9895ffd0b3 SHA-1: 15cade1fbbabbc6a9cb47856561efa6ca1fff981 SHA-256: 32330f2d52ea5ec4dd547f84ada36559cc7eff64c0513dbbf8c6aaf9aaba47f6
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, containing numerous links to external sites, many of which are hosted on disposable infrastructure. One critical heuristic indicates it links to known malicious redirector infrastructure, specifically 'https://yafferge.ru/123?utm_term=arches+national+park+map'. The document body, though heavily obfuscated, appears to contain metadata related to map generation, suggesting a lure to disguise the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=arches+national+park+map In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_60695813abd67.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4445733/normal_60b0445e3845d.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/minegolaxesewit.pdfIn PDF document text
    • https://lesajevix.weebly.com/uploads/1/3/4/3/134318042/7150421.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471985/normal_5fc7fdd4ee22b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_605f5e53d8fce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_60167f2c8894b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459785/normal_5fde7df1d08d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_602b506af082d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5ff29ab83ed69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5feaef2944551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fe8aaa5d3941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_60324a8962083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_5fdbd6c0a7167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_6048bf65f009d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5fc96b603c0d7.pdfIn PDF document text
    • https://samibogamo.weebly.com/uploads/1/3/4/8/134883552/8706120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_5fe697708f472.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144411717/98229552470.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144420771/22134004161.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_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 5224 bytes
SHA-256: d19a60f325e79d49f9d21a0adbc4768d4222b21e8389d2107d4c68cf32c1962f
font_01_sfnt_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 10536 bytes
SHA-256: d13e3eeedc302f5f03d908446a798c399ef5d812224ca4dfe5110f276cb97b9b