Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc342682d60223dd…

MALICIOUS

PDF

88.1 KB Created: 2021-04-03 06:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fcf1cdb5d744da153541d0f8a11f4ce SHA-1: 949e3462825c3e54c46ba5da3d8a5370aab1071a SHA-256: cc342682d60223dd2d361b6154117a0c2709a67263ceaa567b831c0510aa5d7a
166 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, with one specifically identified as a random, algorithmically-generated URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic identifying the PDF as a link farm on disposable hosting support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • 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://pelibifir.ru/wix?keyword=thinking+mathematically+6th+edition+ebook
    • https://cdn-cms.f-static.net/uploads/4380226/normal_6028f8f0a590a.pdf
    • http://gezinuduwep.medianewsonline.com/8840774761.pdf
    • http://rakadan.sportsontheweb.net/94066737764.pdf
    • http://nanamojuvimujo.medianewsonline.com/33404528424.pdf
    • https://cdn.sqhk.co/lifupowaseli/pgPd8Ei/togire.pdf
    • http://polypak.site/how_to_study_sanskrit_class_9x3879.pdf
    • http://riwalimuj.scienceontheweb.net/baroque_guitar_tablature.pdf
    • http://privateguardingserviceagainstdanger.site/wukuxekusexutiguxisamememd0h4q.pdf
    • http://wiinorama.fun/haba_un_sapo_sapo_saponppx7.pdf
    • http://pelistens.xyz/597673859216sgpj.pdf
    • https://cdn.sqhk.co/vixokezafafu/RZ5o7hd/45442941365.pdf
    • https://static.s123-cdn-static.com/uploads/4387050/normal_5ff30f988e3ad.pdf
    • http://mebel-albero.ru/raxinakuwevanudoeozf9.pdf
    • https://cdn.sqhk.co/moxasapiwer/Fghgfjf/55176775501.pdf
    • https://cdn.sqhk.co/fuwufupi/ajighhh/meaning_of_neighbourhood_watch_in_urdu.pdf
    • https://cdn.sqhk.co/zowonefaso/Lfhhg7T/wolf_online_mod_ios.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kofabube/87360319005.pdf
    • https://s3.amazonaws.com/bajapovogam/56957167091.pdf
    • https://s3.amazonaws.com/rutufokedizon/27924449559.pdf
    • https://s3.amazonaws.com/kigavanus/anger_management_for_dummies_free.pdf
    • https://s3.amazonaws.com/pizexopenaxu/aa_attendance_sheets.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011508.bin
65cb419c84d9b79f0ee7b49b1788b8a3f97b7506dd0d1b73725a15d42c0b63f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 5488 bytes
font_01_sfnt_off00012795.bin
933976db0a69143174dea750a6f9950d20add7c4f614b38dccc372f469379072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 12888 bytes

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