Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc376b5d670ae307…

MALICIOUS

PDF

70.8 KB Created: 2021-04-20 21:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b9027bbab599ab81a0711785fc002d7b SHA-1: bbb10bf3586b840fbc7a55826acd5eb5d8adeb3f SHA-256: bc376b5d670ae30765364c51df0e0a9cbd67c54000af4faa8287023e3d36c006
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as a phishing trojan by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this phishing intent. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

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://midufefew.ru/strik?utm_term=tales+of+a+fourth+grade+nothing+novel+study+pdf PDF link annotation
    • http://sale50.pro/862867868400493o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_5fd18a94b7fcf.pdfIn PDF document text
    • http://qqkaxes.xyz/cribriform_plate_of_ethmoid_bonepesww.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465548/normal_6031c8f1c8afb.pdfIn PDF document text
    • https://monowulesamewul.weebly.com/uploads/1/3/2/6/132682048/8c6e6f.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/bibm2hb/pajagozazesagi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5fc596411bf79.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/igidheO/black_friday_iphone_deals_2019_uk_ee.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/e3ickia/asteroid_storm_game.pdfIn PDF document text
    • https://bumifofo.weebly.com/uploads/1/3/4/5/134598811/8113853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_606029bba6bcb.pdfIn PDF document text
    • http://car-test.pro/53730762023lptfi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_60059e45d230f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480904/normal_60593adc1c135.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xakifozosuj.epizy.com/povitubosaritosa.pdfIn PDF document text
    • http://tekabexorita.rf.gd/path_of_exile_labyrinth_guide.pdfIn PDF document text
    • http://lebiwubeso.rf.gd/analog_film_seoul_free.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_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 5412 bytes
SHA-256: 87abe8a4f0e03ab5be9d8e9b8dce4616a5b1c68985d12d18f074ebffab468ab7
font_01_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 10516 bytes
SHA-256: 03f3034bfdc998ce921ea95ceb472f22be3cc78fdbb2f6f227122963c29e7e88

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