Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4e9f6676cea7c4…

MALICIOUS

PDF

71.6 KB Created: 2021-03-21 06:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2ca8f2e29cab934884d335dbd0430b35 SHA-1: 43bafd1f24abb78b86f03b2c5a2acceba9cac19c SHA-256: fe4e9f6676cea7c48cf5d786c0e0b6e02606e1e22fcd77227c5da570ce3dbd5b
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be a lure, likely intended to trick users into clicking malicious links for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=que+come+el+oso+pardo In PDF document text
    • http://tebeririz.scienceontheweb.net/adjectives_and_adverbs_grammar_explanation.pdfIn PDF document text
    • https://xesevurodat.weebly.com/uploads/1/3/0/9/130968943/d80aa467b913e8.pdfIn PDF document text
    • http://getallcreditscores.info/20515449850319hd.pdfIn PDF document text
    • http://fifamarketbot.com/dd_3.5_prestige_classes_tier_list79rgb.pdfIn PDF document text
    • http://sun-italy.space/how_to_learn_to_read_tarot_cardsdpsrf.pdfIn PDF document text
    • https://cdn.sqhk.co/bodavadu/j55kCgg/xatejazagotugelutux.pdfIn PDF document text
    • http://timecodes.net/bajalebejulipuragq87sx.pdfIn PDF document text
    • http://radanews.site/2pac_7juljf.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/Iidjejf/11951704648.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405195/normal_5fef45e9a8885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_5fd2df7a6cf96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470836/normal_5ffcb540491f0.pdfIn PDF document text
    • https://rinavufapakoto.weebly.com/uploads/1/3/4/4/134460237/wugubigidap.pdfIn PDF document text
    • http://fbdirect.site/18223202388fmp9p.pdfIn PDF document text
    • https://zevakevo.weebly.com/uploads/1/3/5/4/135400716/buzopajoropipikera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_6033398e7fc3b.pdfIn PDF document text
    • http://benilobodereji.mygamesonline.org/mazonoketofasipug.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_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 5280 bytes
SHA-256: 350773111ac18eaaa5ab080f3003382cd4baa7341720ada21908bde35e7947d1
font_01_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 11736 bytes
SHA-256: fa1beb2e5cbaa2a55f92b8a661fda81cfa0602ffaa9d5ad1bcade60ad3f2131c

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