Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cb2ad279342d82…

MALICIOUS

PDF

74.7 KB Created: 2021-06-09 05:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32ed30c165af9a26b3bcdd739af3cc30 SHA-1: ed06d037247cd8de97d7ae266ceacc4d7d30fdee SHA-256: 67cb2ad279342d820285c25dee405ad1051e8b406572639e5710dad4aa52238b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'quickshortcutmaker apk 7.0 download', suggesting a lure for users seeking software. The presence of numerous external URLs, many pointing to disposable hosting or link farms, further supports a phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://oniceh.ru/pbw?utm_term=quickshortcutmaker+apk+7.0+download
    • https://cdn-cms.f-static.net/uploads/4376086/normal_60673dd75878e.pdf
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fc641001c881.pdf
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/kadodolilomapo_titab_lakigegonik_jimape.pdf
    • https://cdn-cms.f-static.net/uploads/4367952/normal_601128ab991c4.pdf
    • https://cdn-cms.f-static.net/uploads/4374704/normal_6027ceee74c48.pdf
    • https://cdn-cms.f-static.net/uploads/4458394/normal_60120e6c59a2c.pdf
    • https://zofoxutugutijor.weebly.com/uploads/1/3/0/8/130874595/tukavulemifo-tebajowozum-jabix-nexetiva.pdf
    • https://lupenasax.weebly.com/uploads/1/3/4/7/134738003/bekokabuforam-bokujarilure.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tujelupirobe.pbworks.com/w/file/fetch/144493938/kaxokogapegaxesog.pdf
    • http://wemekojezum.pbworks.com/w/file/fetch/144597756/vopugolefagusavip.pdf
    • http://zizovitunex.pbworks.com/f/jifadavifujuxiki.pdf
    • http://pevaludim.pbworks.com/f/75118396484.pdf
    • http://wisarazed.pbworks.com/f/42043749594.pdf
    • http://luwivaj.pbworks.com/w/file/fetch/144516090/73127330314.pdf
    • http://ruwomodanom.pbworks.com/w/file/fetch/144691362/non_alcoholic_beverages_classification.pdf
    • http://larabefejaji.pbworks.com/w/file/fetch/144502509/how_to_get_dating_format.pdf
    • http://fodorafirig.pbworks.com/f/how_to_install_bilstein_5100_front_shocks.pdf
    • http://tovovojufa.pbworks.com/w/file/fetch/144676092/como_saber_quem_viu_meu_instagram_stories.pdf
    • http://moxulolo.pbworks.com/f/mimirezital.pdf
    • http://bezawagiga.pbworks.com/f/cch_xa_ti_khon_twitter_khi_b_nh_ch.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_off0000e258.bin
49782ddada07babef1c9d48fb77794bebab08f2396657a7cc48b8856078f8f0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 5784 bytes
font_01_sfnt_off0000f602.bin
1225f8882c7935a6c735861243b47c741c5eea059147e1d13a53b04737fcaa74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 12252 bytes

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