Malicious PDF — malware analysis report

Static analysis result for SHA-256 005e8196a8d788b1…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 13:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 995500b7b22a0e582cda026df8ad789a SHA-1: b6eb2b61dc916021cf431baa972b607418cc77cc SHA-256: 005e8196a8d788b1d9b169be66736a9974a441ee471fe06bed09a60da726d470
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/award?keyword=willful+blindness+book+pdf
    • https://cdn.sqhk.co/matikefateri/hcE7Y7u/revenge_of_the_machine_spirit.pdf
    • http://gufurebu.medianewsonline.com/bomujejeg.pdf
    • https://kisagisetiduke.weebly.com/uploads/1/3/4/7/134762251/46326.pdf
    • https://wolofineso.weebly.com/uploads/1/3/4/5/134598063/tenigerogubekiw.pdf
    • http://difuwikikum.iblogger.org/wekajuf.pdf
    • https://rojuligu.weebly.com/uploads/1/3/0/9/130969709/8e5992937.pdf
    • https://pejegenipejixe.weebly.com/uploads/1/3/4/8/134848799/8382952.pdf
    • http://kaxogibigonubib.22web.org/suudi_arabistan_tarihi.pdf
    • http://jugepawe.medianewsonline.com/sozij.pdf
    • https://xebazasasixuj.weebly.com/uploads/1/3/4/6/134641459/2755893.pdf
    • https://cdn.sqhk.co/raxedaninaso/haojbif/check_battery_health_android_xda.pdf
    • http://wipebodu.mypressonline.com/apprendre_le_russe_gratuit.pdf
    • https://zerimesatevig.weebly.com/uploads/1/3/4/8/134879836/6316645.pdf
    • http://xitodefigatefuj.medianewsonline.com/formula_del_volumen_de_un_prisma_de_base_triangular.pdf
    • https://cdn.sqhk.co/xibumediw/hbuiihi/wuzijefiwiteboz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rurebafib.onlinewebshop.net/nimijijosame.pdf
    • http://dozuxix.myartsonline.com/ropuvoxoz.pdf
    • http://fesarogivur.rf.gd/how_to_set_my_g_shock_analog_watch.pdf
    • http://safadixuzet.rf.gd/citroen_c4_cactus_2015_manual.pdf
    • http://lijivuzase.rf.gd/35133702996.pdf
    • http://xadilopavut.myartsonline.com/wololizamakari.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_off0000f1d4.bin
087ba142fc6e9e8d368f15291c6888a10333c0c3428d0353eeac165bd2504098		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 4944 bytes
font_01_sfnt_off000102ce.bin
cd71e7b1da7ad2c311840ae8b6e7d592bb1adcaa21793d2dfabde2d0113638df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 10796 bytes

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