Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa3c8a11b8c7d99…

MALICIOUS

PDF

65.4 KB Created: 2020-12-30 00:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a698ec68276f1afcb3f3316b26d0bffc SHA-1: b8650d03f4ec24406ddb761a61d580b64bb47a03 SHA-256: dfa3c8a11b8c7d99b1c59be8b8fe0abb6a5ffc1a85ee3437627c07e3ad07724f
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure malicious redirectors. The document body, though heavily obfuscated, suggests a lure related to 'free bible crossword puzzle games'. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicates malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://gettraff.ru/strik?utm_term=free+bible+crossword+puzzle+games In PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/bekilaxi-devamuw-wadodukofamepo-buwosud.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/liniwafelezagud_gatitogeroluva_mejumige.pdfIn PDF document text
    • https://safikevobajegev.weebly.com/uploads/1/3/4/3/134352312/penoj_gowexenedo_wumapavaj.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/zexob-panokagebaf.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/fgFifgh/sezubusoja.pdfIn PDF document text
    • https://gemujofu.weebly.com/uploads/1/3/4/3/134372819/8456169.pdfIn PDF document text
    • https://lexigeme.weebly.com/uploads/1/3/4/5/134524735/pirono_sezotuliw.pdfIn PDF document text
    • https://tovigaxibikufa.weebly.com/uploads/1/3/4/8/134875165/pewix.pdfIn PDF document text
    • https://xewurilarigifu.weebly.com/uploads/1/3/4/2/134236076/6086358.pdfIn PDF document text
    • https://cdn.sqhk.co/bewiviki/nFjjlgd/59397167634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aff0385-4c23-428d-b2fd-487a11338ce1/metal_slug_3d_ps2_iso_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/chicago_manual_of_style_quick_reference_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/telugu_bible_books_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b0530c-c19e-4d26-aec0-a47d60040847/20470329175.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_off0000c254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC254 5632 bytes
SHA-256: 08bec4bf4e6eace714e3b2a7864c6dac487b8d85bae77fff96803a4cd8694ae6
font_01_sfnt_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 10364 bytes
SHA-256: 6bd07c6d12dfd3ee1e37ec2ec299f9756d1d8dba0a0bf929fea236d264b29cd5

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