Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9d510db5d7d130…

MALICIOUS

PDF

79.3 KB Created: 2021-02-18 21:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c44ccebc609d76fb7b4d1cf30fbb7b96 SHA-1: 4a742aca9a4e6276cd6ce8ee92c6ce67b35da5f7 SHA-256: cc9d510db5d7d1307b808d66102d034e33530350a842e0b950f289b914e4fa7a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics. No scripts were extracted, but the high number of suspicious URLs indicates a strong likelihood of malicious intent.

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://druttle.ru/123?utm_term=the+book+thief+movie+and+book PDF link annotation
    • http://espaceabone.com/bingo_lotto_tombola4zqxu.pdfIn PDF document text
    • http://free-at.pro/new_bihari_song_20189xd7n.pdfIn PDF document text
    • http://wersita.fun/bombay_dyeing_bed_sheets_online_salejfvua.pdfIn PDF document text
    • http://help-nanny.site/best_paranormal_romance_book_series_for_adultsulffk.pdfIn PDF document text
    • http://my-favshopf.online/62723579433yq4cb.pdfIn PDF document text
    • http://clientesdkb.com/la_chica_de_ipanema_acordesex82c.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/IgjfiiA/62581787852.pdfIn PDF document text
    • http://mscredit.info/julewuvagevasozajodui3d7t.pdfIn PDF document text
    • http://ctyr.ru/43500394717heqvy.pdfIn PDF document text
    • http://smcjd.com/62225839357aflax.pdfIn PDF document text
    • http://fartook.online/nubadowijepadslm9a.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/heGGaie/elon_musk_mars_colonization_video.pdfIn PDF document text
    • http://theharaka.online/88386450218ip3ot.pdfIn PDF document text
    • http://idealica-itufficiale.website/18473348045jyzhp.pdfIn PDF document text
    • http://begemotiks.space/pizupejalixeyfz2r.pdfIn PDF document text
    • http://begdas.space/twilight_fanfiction_master_of_the_universea5k1t.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/jhhcJtH/beijing_ducks_basketball_jersey.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/jczlnXJ/mofumojefobepotoligita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tizidirek.rf.gd/tulokijanij.pdfIn PDF document text
    • http://divupovive.epizy.com/soft_skill_vs_technical_skills.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_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 5056 bytes
SHA-256: 7ee21f2075497f153492e7e3af08d7e81e603244ef6dd72a13b8cdd677e9db87
font_01_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 11224 bytes
SHA-256: c954c644f7709ca2e35a1d759f7e4138241485563246bbca291239024c691039

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