Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f51294237865a2b…

MALICIOUS

PDF

153.7 KB Created: 2020-10-01 18:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: de14cf77bddc696f1fa46f110a2ea17f SHA-1: fc4e9a33ca875e2dcf24965fc0b24be5c2b4ee65 SHA-256: 3f51294237865a2b304d5206355db8602a578f20156fcf0cb87225d395bc58c3
124 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of these links suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the document structure and embedded links are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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://gettraff.ru/strik?keyword=microbiology+virology+pdf In PDF document text
    • https://site-1038331.mozfiles.com/files/1038331/memakivexozaset.pdfIn PDF document text
    • https://site-1036692.mozfiles.com/files/1036692/nanerojijukenepavadur.pdfIn PDF document text
    • https://site-1036639.mozfiles.com/files/1036639/71014178484.pdfIn PDF document text
    • https://site-1039171.mozfiles.com/files/1039171/zodifipakaluruwij.pdfIn PDF document text
    • https://site-1037860.mozfiles.com/files/1037860/98356372074.pdfIn PDF document text
    • https://site-1037010.mozfiles.com/files/1037010/nuduzijo.pdfIn PDF document text
    • https://site-1036982.mozfiles.com/files/1036982/nolegufofunojuradatofawat.pdfIn PDF document text
    • http://files.thehillchristianfellowship.com/uploads/1/3/1/4/131409017/nazavip.pdfIn PDF document text
    • http://files.angeliquelarson.com/uploads/1/3/1/4/131437685/lujopujakif.pdfIn PDF document text
    • http://files.spinecarechiropractic.net/uploads/1/3/1/3/131384018/30437.pdfIn PDF document text
    • http://fumube.warbirdsunlimited.com/uploads/1/3/0/7/130775990/vuvarope_kutewoxi.pdfIn PDF document text
    • http://buwuwe.threefishesframing.com/uploads/1/3/1/3/131380011/varagapisiforose.pdfIn PDF document text
    • http://ninujaxe.mkalust.com/uploads/1/3/1/6/131606289/tetebugeda-vijasapamowu.pdfIn PDF document text
    • http://files.firstsounds.com/uploads/1/3/0/7/130775471/lufesikipu.pdfIn PDF document text
    • http://melolago.cc4cl.org/uploads/1/3/1/3/131384169/2467848.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00021669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21669 5244 bytes
SHA-256: 9ca4dc93ef1c9ab8235350ca99cf81c3ee6a110c6b1eed28304d658ef9eb4370
font_01_sfnt_off0002286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2286A 15560 bytes
SHA-256: 6a922f8c0e1774af917c066946ea2b14c1ff21ae4c8f768e65594a847499c245

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