Malicious PDF — malware analysis report

Static analysis result for SHA-256 306e1047a72a1d12…

MALICIOUS

PDF

83.6 KB Created: 2021-03-02 13:09:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 23c7b6753952bf678074189108ff8773 SHA-1: 0b0af021b32824345933a8440587ba556756d7bc SHA-256: 306e1047a72a1d124b88af2d51c5ca68c47d436e00ee80abb9e5eac745d06cd0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain, likely serving as a lure for malware distribution or phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a deliberate attempt to create a network of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=excel+vba+instr+replace+text PDF link annotation
    • http://bivasezi.iblogger.org/18151595779.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/jfGhWif/ballinger_isd_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/hNjjDij/arcade_fire_everything_now_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/ijachbZ/inox_knives_germany.pdfIn PDF document text
    • https://cdn.sqhk.co/fanoxozowupe/gcOichd/only_one_ali_gatie_lyrics_traduction.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/iaZhejc/waxoxibef.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/ziehtic/sekifazukefazorive.pdfIn PDF document text
    • https://cdn.sqhk.co/zorezikuluz/dmUSUgi/wamujerix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_60202960c9fa3.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/hijU3jc/macbook_wifi_analyzer_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/BwgiHgi/absorption_of_light_process_photosynthesis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501198/normal_600247562da23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvegebufu.epizy.com/darn_tough_size_guide.pdfIn PDF document text
    • http://givosike.rf.gd/bakery_business_plan_in_hindi.pdfIn PDF document text
    • http://poposumezaxek.rf.gd/89489172058.pdfIn PDF document text
    • http://sexupoweduf.epizy.com/2017_honda_civic_maintenance_schedule_canada.pdfIn PDF document text
    • http://gebopotaxe.rf.gd/49037193799.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_off00010631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 5152 bytes
SHA-256: c1e76246d9fad7a7ee95202cefe1e32d25b640bf8ac840575e7ef62caaacaf4e
font_01_sfnt_off000117cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 12812 bytes
SHA-256: d3ca51dcc60d818bb6a0b292d61eea6072670134959638acec6713080d5ff69e

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