Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bed9facfab989f…

MALICIOUS

PDF

75.6 KB Created: 2021-05-13 06:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f49e4dff99153be6ef7151ed99381bdd SHA-1: 659a0b181dbf79b899913c401c81704f36baf63c SHA-256: b3bed9facfab989f2d6360f1754eabefcb15ae8d39447b4cf6af2e6a93672e2d
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, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'How to set up jam hang up speaker', which appears to be a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=how+to+set+up+jam+hang+up+speaker PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473645/normal_6002090f9aa2d.pdfIn PDF document text
    • http://menformula.xyz/how_to_authenticate_medical_recordsw8jpp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416930/normal_5fec4fdeb957b.pdfIn PDF document text
    • http://nazomomomujo.iblogger.org/42735297533.pdfIn PDF document text
    • http://housefashion.ru/faturuxulirag7q6f.pdfIn PDF document text
    • http://jojalipubawil.22web.org/what_does_it_mean_to_dream_about_a_baby_girl.pdfIn PDF document text
    • http://tramlaweq.online/3712387781300o6h.pdfIn PDF document text
    • http://taher-tcac.com/formal_attire_template_vector8gfif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_60417c1e759e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zefobik.epizy.com/36482765678.pdfIn PDF document text
    • http://zapurokorilagar.rf.gd/71897486824.pdfIn PDF document text
    • http://gofeneneju.rf.gd/mcp61pm-hm_rev_2.2_specs.pdfIn PDF document text
    • http://sonogobujajeva.rf.gd/estructura_texto_argumentativo_inductivo.pdfIn PDF document text
    • http://sizemogigu.myartsonline.com/verogosetorifat.pdfIn PDF document text
    • http://patuwovoparivi.rf.gd/vuwudizizew.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/ti_89_titanium_calculator_manual.pdfIn PDF document text
    • http://newotev.rf.gd/osama_bin_laden_biography_download.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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 5396 bytes
SHA-256: 264fa746426e26c0f9965ec4bffb19b97fd5de924d29da92914bbb89e1477f9c
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 11152 bytes
SHA-256: c79ed7febe76737f3f5582e3b7b349660cb7c75b996f8c31e0b787b0314e2833

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