Malicious PDF — malware analysis report

Static analysis result for SHA-256 92604575d0fb4435…

MALICIOUS

PDF

78.1 KB Created: 2021-02-03 09:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9f322beb8f40cf378ed7bc092896b836 SHA-1: 8931ce434e1300fcdae03aa934693ab1d0fca665 SHA-256: 92604575d0fb4435d6a786fd325acae73c6b7d08df4d2cdc9e96e60040041dbb
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded URLs pointing to link farms hosted on disposable domains, a common tactic for distributing malware or phishing content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to external sites, likely for malicious purposes. No scripts were extracted, but the presence of numerous suspicious URLs and the link farm heuristic points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://bologen.ru/123?utm_term=showermate+bluetooth+speaker+instructions PDF link annotation
    • https://cdn.sqhk.co/dosapupa/aghjjih/.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/jfidEhc/gobatanakikovozewopu.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/giajghh/94279789945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_600fff59aa87e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451039/normal_5ffd4b1d53c52.pdfIn PDF document text
    • http://boevoenlp.com/migrate_microsoft_authenticator_to_new_phone_androidj2wqj.pdfIn PDF document text
    • http://kopawaruda.22web.org/lukad.pdfIn PDF document text
    • http://fujopijur.iblogger.org/data_analysis_and_interpretation_using_spss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/windows_10_activation_key_32_bit.pdfIn PDF document text
    • http://jedasuzafofirif.epizy.com/information_about_neet_exam_2018.pdfIn PDF document text
    • http://zujexig.epizy.com/69514896046.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/pct_applicant_s_guide_china.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_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 5572 bytes
SHA-256: eb265b130df74be88f1e6ecfc08f7f88645c1c43e8d1bc8294cf12a65c278789
font_01_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 12480 bytes
SHA-256: e7af83d5ce8e9fc42bd3faf6c0e757fb1f38718e447fc78cf40389a7fd7520c9

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