Malicious PDF — malware analysis report

Static analysis result for SHA-256 3722c4e17e86b919…

MALICIOUS

PDF

70.3 KB Created: 2021-02-19 02:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8a919862686d12f1bc4bd27e541af18f SHA-1: 54b4fc97c14c8c16390c6e663d49ee5bc7aaa4c6 SHA-256: 3722c4e17e86b919eb6bd70772840f3adc95b3a7294a5ae30f8bc1e7069e8124
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or scam attempt. The presence of URLs like 'expressvpn.store' indicates a potential lure for users seeking deals or services.

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://seumenha.ru/123?utm_term=samples+of+self+assessment+essay PDF link annotation
    • http://expressvpn.store/84247496700ybyyc.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/jfialIu/black_friday_amazon_alexa_deals_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_600a24d145e01.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/d9WcOYp/nuts_and_bolts_organizer_menards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376866/normal_5fc69d4ae92da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5ffd7d0be5cc3.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/73fm4hh/33387574086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477409/normal_601652172daf1.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/12117905710cxc6r.pdfIn PDF document text
    • https://cdn.sqhk.co/nofevemumidu/myQjfjb/puzzle_and_dragons_gold_characters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369332/normal_5feb002cdca37.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/5jcie3t/kazawenudujelovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_60174fab8c0b7.pdfIn PDF document text
    • http://francobusiness.com/egregious_eleven_diabetesasq8r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dabesajunelazul.rf.gd/coffee_meets_bagel_dating_app.pdfIn PDF document text
    • http://dibulazovila.rf.gd/dengue_shock_syndrome_guidelines.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_off0000d733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 5156 bytes
SHA-256: 8d10e0cdde14b3e6d17e0353490b1bef20fa0f0e0a3d2697e458fadaf8478443
font_01_sfnt_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 10532 bytes
SHA-256: b30cbdf3f64963eb59480c151ae33e673fbfb7dde4aee46acb94337226ffcf42

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