Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2d11a90cd3ad55…

MALICIOUS

PDF

75.1 KB Created: 2021-04-10 11:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb827e893b6f857cdd06a705531a9195 SHA-1: b79af3d6d6ad7e7cf7acecb170832a46e46a9edf SHA-256: 3a2d11a90cd3ad55d697d9a44f664cb3bb796a5023c6a9119c8b63c818bfa9dd
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though truncated, contains text related to 'Bruce lee's fighting method book pdf download', which is likely a lure to disguise the malicious intent. The presence of numerous external URIs and the ML classifier's high confidence score indicate a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=bruce+lee%2527s+fighting+method+book+pdf+download
    • http://zigodijod.iblogger.org/surface_pro_annotation.pdf
    • http://betafiwes.iblogger.org/essentials_of_biostatistics_in_public_health_sullivan.pdf
    • http://masito.space/blue_bossa_backing_track_150oc88y.pdf
    • https://nalepigetor.weebly.com/uploads/1/3/0/9/130968958/duwilojise_wesip_letovuteluxuj.pdf
    • https://bugedosase.weebly.com/uploads/1/3/2/7/132712019/figugod.pdf
    • https://galibemad.weebly.com/uploads/1/3/1/8/131856827/ledeg-besekuwekedo.pdf
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/sazago.pdf
    • http://xafegadixugu.iblogger.org/5864425717.pdf
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/mujegake.pdf
    • https://xidaxawefitorat.weebly.com/uploads/1/3/5/9/135958331/92067bc3310f.pdf
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/zitikibirenaru.pdf
    • http://meetporte.xyz/class_11_physics_chapter_9_ncert_solutions_in_hindims4lp.pdf
    • https://xevekarisugi.weebly.com/uploads/1/3/4/6/134697334/mujejewegux_duzumurabip.pdf
    • https://dizubegunusu.weebly.com/uploads/1/3/4/8/134889053/034f881c4a259.pdf
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/lafalasi-vuxowadugebe-muridumifesuzo-xegajevemuxa.pdf
    • https://xuwejemeluk.weebly.com/uploads/1/3/4/3/134314543/6d1c3e131c3af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jomewudixaf.epizy.com/public_finance_and_taxation_2.pdf
    • http://katewamopexo.rf.gd/how_to_get_certified_to_do_eyelash_extensions_in_ohio.pdf
    • http://tavewafed.epizy.com/vuejs_admin_template_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e406.bin
bc0dca6325386382fb63f5a77c2b768a886af2bd3de0466008c68bdf725a0553		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 5948 bytes
font_01_sfnt_off0000f82d.bin
e83653584eac4e7cd4f761f29739b2f691125ae7a4d360c821a5a2a97c416030		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 10884 bytes

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