Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66b3bbb7970b2dc…

MALICIOUS

PDF

82.0 KB Created: 2021-01-31 23:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 50583bb06c6fac29b1ab1b2098be3cb4 SHA-1: 1cf3786f8c2427205d36981f510c6cd83ad1e426 SHA-256: c66b3bbb7970b2dc0068d1a3fddf0d08f6061e945c2e1d0f9c5f17b6393e6312
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high likelihood of malicious intent. The ML classifier and ClamAV detection strongly support this assessment. While no scripts were explicitly extracted, the presence of external URIs and the link farm nature suggest the document is designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

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
  • 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://seumenha.ru/123?utm_term=the+death+of+good+ser+ruth PDF link annotation
    • https://cdn.sqhk.co/tenokesime/gghnidy/diderosofaweruzizupiwij.pdfIn PDF document text
    • http://jsexj.fun/apttus_clm_developer_guide2kxil.pdfIn PDF document text
    • http://future-techno.ru/jai_shree_ram_song_dj_mix_2017_mp3_downloadqwwu6.pdfIn PDF document text
    • https://cdn.sqhk.co/sebelokili/7mX3zDB/megeverujuguwibubonen.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/je3jjhj/41148827178.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/hohgOje/coin_master-_real_coin_pusher_machines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_5fd3da2fd4702.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/7Ihh1I4/radibitodawatopavak.pdfIn PDF document text
    • http://zoo-taxi.site/stative_and_action_verbs_list952b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371786/normal_5fef0219697ed.pdfIn PDF document text
    • http://infokurs.design/685006063420p7nn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sedijinuv.epizy.com/alarabiya_bayna_yadayk.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/canonsburg_police_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/77891115752.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 4816 bytes
SHA-256: 9171cc4983e32e3a2a8619e0067cd2df690dd661953321fdcd808e7ac0209404
font_01_sfnt_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 11036 bytes
SHA-256: eaa3cf441dab6e3930ba182fb9dfe6c0411259424dfce009d05cb6c4baab9cb8
font_02_sfnt_off00012d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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