Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52dfc625096e8e2…

MALICIOUS

PDF

80.2 KB Created: 2021-03-17 21:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeb36cadb617b8fa2169b49ef424e0df SHA-1: 7292eb233fc88f933f233f75ab9e95575b0f7745 SHA-256: c52dfc625096e8e2376eb56151e1faea358928a58a015386336b76fc88637693
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable or unknown hosting, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/aws?utm_term=spanish+verb+conjugation+worksheets+pdf
    • http://sarkife.site/how_to_determine_rebar_sizebwz31.pdf
    • http://fullstacket.online/rslogix_5000_support_for_firmware_revision_19.1lohuf.pdf
    • http://trokot-newshop.online/25796151822is1qs.pdf
    • https://cdn.sqhk.co/juxezijafoz/phdQfl9/make_your_own_music_video_app_free.pdf
    • http://termometr-medikal.site/afro_brazilian_tarot_book4vfc9.pdf
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/8561219.pdf
    • http://cucoupon.info/17913669401pf0m2.pdf
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5fe2add58ab4b.pdf
    • http://arthromedshop.xyz/what_is_a_deviance_in_sociology1sa18.pdf
    • https://cdn.sqhk.co/jisogixij/1hekcSs/7924888770.pdf
    • https://mikixobitesa.weebly.com/uploads/1/3/0/7/130776626/b294a9888e.pdf
    • https://cdn-cms.f-static.net/uploads/4367300/normal_6032f67d8ce2b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zabuzuko.epizy.com/41045245607.pdf
    • http://magivuxitafexox.rf.gd/bigiwasebixalu.pdf
    • http://walexesanub.rf.gd/bawara_mann_jolly_llb_2_karaoke.pdf
    • http://molutuganum.epizy.com/lipunuwujomenunufavut.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92e.bin
3964776dfa0002fedb68a2cee3532278887c2b8e67d12577e3160cc92ea456ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 5800 bytes
font_01_sfnt_off0000fce5.bin
a6cbe845cc68fbd0ec743cc361900c755973945561c06287be9b3ee027d94aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 12572 bytes
font_02_sfnt_off000125d4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 4324 bytes

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