Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3494ca8f9fa0f9f…

MALICIOUS

PDF

72.3 KB Created: 2021-02-15 13:09:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ab63a6869b168f1d828f25836db6f3ee SHA-1: 39a6d2756ed69fbe008831a5ea78b3989a660180 SHA-256: f3494ca8f9fa0f9fd467e5e947004f739906f84599751892ee73e12cdced5165
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a likely attempt to redirect users to malicious content, potentially involving embedded JavaScript for obfuscation or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://jacksth.ru/123?utm_term=ergo+360+omni+infant+insert PDF link annotation
    • http://xrootunited.com/beauty_plus_app_for_androidibvn1.pdfIn PDF document text
    • http://wirelessinfo.ru/pefiligotidafiwofalumaqsj8l.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/xPKjih2/31833838001.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/y0tCjfD/skyblock_servers_mcpe.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/8932242.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/Y1ghibt/segugazasorok.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/jVhZYOl/blue_light_glasses_target_in_store.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/4240145.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/3815915.pdfIn PDF document text
    • https://cdn.sqhk.co/sozetojedisu/hfhcDgh/gepotakafutupo.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/WTjfifE/switch_eshop_saver.pdfIn PDF document text
    • http://spoonnumberone.xyz/280685228829smi9.pdfIn PDF document text
    • https://zabojipenow.weebly.com/uploads/1/3/1/6/131636987/654e0.pdfIn PDF document text
    • https://riwipawubo.weebly.com/uploads/1/3/1/4/131453561/sumelugopu-xuzitozeguzaju-lilerigidodara-vawomilivo.pdfIn PDF document text
    • http://triple-doska1.club/webenenofuvakumabzknxo.pdfIn PDF document text
    • https://cdn.sqhk.co/danexili/TBihiek/wilderness_survival_training.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/LHhesxe/vex_4_crazy_games.pdfIn PDF document text
    • https://xofijenafoku.weebly.com/uploads/1/3/5/3/135349300/301685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tofizo/95448165385.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/boxhead_zombie_wars_on_android.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_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 5472 bytes
SHA-256: 9f161d0b65c0e535c0fa2aa909e5b61fd1853c3c6785020f53615c462ad02ddb
font_01_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 10440 bytes
SHA-256: 8436d7459e971a1ea0a6345cbf457f5c212fec063c27ee564231b9fda46ef035

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