Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b2fb11845d2c9b…

MALICIOUS

PDF

72.2 KB Created: 2021-03-03 18:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 039b524e3681b97fa2896805497e3997 SHA-1: 4e1ab3d461a0cc22519e954b11c2df1c4b5fbae4 SHA-256: 01b2fb11845d2c9be72546d917d2959dbf55102a2343f5573bbc34e8632e53df
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector to malicious infrastructure. The embedded links, such as 'https://yafferge.ru/wb?keyword=how%20to%20open%20sentry%20lock%20box', are designed to lead users to potentially harmful websites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for creating malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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/wb?keyword=how%20to%20open%20sentry%20lock%20box In PDF document text
    • https://sagejajake.weebly.com/uploads/1/3/5/3/135303377/jagebake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5fe6fe7f00a7c.pdfIn PDF document text
    • https://wabemogulumog.weebly.com/uploads/1/3/4/3/134384503/49879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_603a41eb80b89.pdfIn PDF document text
    • https://gegovowazuravas.weebly.com/uploads/1/3/1/3/131398401/sarogif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_603e0944ed14d.pdfIn PDF document text
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/4048168.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/jijobiro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479445/normal_5fdd5ad830925.pdfIn PDF document text
    • https://guwemegarorara.weebly.com/uploads/1/3/4/3/134353603/supax-wajodepe-guvufurirido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_6010062a882f8.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/0b49dd378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_60167d798a08d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_60145f8f460a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_603ea860d01bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://romofimor.onlinewebshop.net/jamudamiwifapelaka.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/macbeth_act_5_scene_7_modern_english.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_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 5144 bytes
SHA-256: 0d0f2f72b75c62162a2bd945395226afe843abede06be9844afa78af7045c2ba
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 10180 bytes
SHA-256: b0cb450aa4f5b2240aa641e65786cd818e91e10205cfa2b606d980496cc9f330

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