Malicious PDF — malware analysis report

Static analysis result for SHA-256 565a1bb2eb7605e5…

MALICIOUS

PDF

75.9 KB Created: 2021-04-04 07:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 046ed8aea1468e4abbde94e4cbc41bb6 SHA-1: 9395e6d93f491e71bae8885185f13fe39dcc2926 SHA-256: 565a1bb2eb7605e5d9b90c3ee2d26e1b7dec2d1b0482581e8e9b24f79993f06d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to a phishing lure disguised as setup instructions for a Fitbit device. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=how+to+setup+my+fitbit+flex+2
    • https://static.s123-cdn-static.com/uploads/4483604/normal_5fdf73bf2bca4.pdf
    • https://cdn.sqhk.co/fekawitaxug/YHii6Zt/rare_pokemon_cards.pdf
    • https://cdn-cms.f-static.net/uploads/4449783/normal_602f726a879ef.pdf
    • https://cdn.sqhk.co/pajokiman/mnhhBia/12785006339.pdf
    • http://prizinsta.info/92127977541326ro.pdf
    • http://plusstore.pro/11627077702otsz9.pdf
    • http://betmoy54.com/hymn_to_freedom_oscar_peterson_spartitogqhpe.pdf
    • https://cdn-cms.f-static.net/uploads/4384628/normal_60563ff94f0f3.pdf
    • https://static.s123-cdn-static.com/uploads/4419412/normal_5fc9ab2dd5706.pdf
    • http://hookup154.space/32576279523zxnnc.pdf
    • https://cdn.sqhk.co/fuwuwoki/LRge9ib/material_requirement_planning_notes.pdf
    • http://trysoda.club/sulupabivuwlgddb.pdf
    • https://cdn-cms.f-static.net/uploads/4391634/normal_602d8cfe339c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://demajipo.rf.gd/6518635179.pdf
    • https://uploads.strikinglycdn.com/files/a2a8d1b5-33c4-4aeb-87bd-64e4f372ff28/migetov.pdf
    • http://gikekim.rf.gd/average_aptitude_tricks.pdf
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_adf5bb604a894b64ac5da3379745e7c2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/995abc1c-bd6c-4212-b487-22f1da88be0e/why_do_police_use_brutality.pdf
    • http://mogipenen.rf.gd/pdf_file_sample_paper.pdf
    • http://gazusoketa.epizy.com/76351221576.pdf
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_3b9423a28e7248e7bcbb14a3ed2541f3.pdf?index=true
    • 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_off0000eb30.bin
4b44592d01ee355c8b498a0f399bc4aec56171308d5d4143bf1d780cf677bfe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 5236 bytes
font_01_sfnt_off0000fd11.bin
baa66ec6753f4fcce0cdbdead88bc720c9c5c7e2be111511188d427ffa210221		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 10444 bytes

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