Malicious PDF — malware analysis report

Static analysis result for SHA-256 42620c095ca10e93…

MALICIOUS

PDF

69.3 KB Created: 2021-03-15 07:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e49729492bd4dea14c8e023915d544ec SHA-1: b594c6927d97af34fffd2ab29741d78cbe5c61a9 SHA-256: 42620c095ca10e9355365aa8927742ca0dcc0fb6cbd4cc85d265638376b2acdc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to suspicious or unknown domains, indicating a link farm designed to redirect users. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and the nature of the URLs point towards a spearphishing attachment as the initial attack vector.

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://jottigo.ru/strik?utm_term=john+deere+mower+seat+springs PDF link annotation
    • http://gatorama.space/kepowubusezokakunixl0609.pdfIn PDF document text
    • http://badge-verification-center.com/acetone_safety_data_sheet_nzakwqi.pdfIn PDF document text
    • http://winoorama.fun/57372982923i88ut.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/FFjdja4/71674365893.pdfIn PDF document text
    • http://usesol.xyz/392810184296xuy1.pdfIn PDF document text
    • https://cdn.sqhk.co/zipedufipiz/jizhfqw/67086312355.pdfIn PDF document text
    • http://autocredit.moscow/kezukufojukeborifodudirrdi95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/audio_driver_for_this_pc.pdfIn PDF document text
    • https://8c8a1d26-85df-410e-9d08-38b72659c452.filesusr.com/ugd/63f22d_f48940c789c74569a0e8e9a72ff27109.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_b6c7e4ce420645d193a62833ad34f496.pdf?index=trueIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_c515900846904d47b9a846be53a34d52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e621d084-930b-4340-b653-3eeb3bf94d7e/97179597702.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/spotify_web_player_mobile_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff07d79-5bfc-4469-a3d5-32f137fdfd4c/kotuxasoga.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_26dda4ff421648209f946c1bd02fc0f8.pdf?index=trueIn 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_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 5420 bytes
SHA-256: 34ef080d66801a1a5d62b32edd19a62005ae0fc6c9c175cda7419c873a2042bb
font_01_sfnt_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 10772 bytes
SHA-256: 99f5cc1c0d6c1420b28c356f7ab57e9cd53d3ec244307a15de8b6d4e6c0a4e46

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