Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6029da21f944ee5…

MALICIOUS

PDF

73.3 KB Created: 2021-06-08 04:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 821f0f02da032ee231183756a4575623 SHA-1: e45f58bbca2fdeb4b3ffa5b1f89748dbb425204e SHA-256: a6029da21f944ee59446d6ee6d529d7a1e21e9c8344c0c77d25acd22553c51df
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be related to fitting a towbar, likely a lure to disguise the malicious intent of directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://wastran.ru/pbw?utm_term=fitting+towbar+to+nissan+qashqai+instructions PDF link annotation
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/goworaleribotaj.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/vagoko_litemulisenew.pdfIn PDF document text
    • https://zukikopan.weebly.com/uploads/1/3/0/7/130775822/terunuwe.pdfIn PDF document text
    • https://labiduto.weebly.com/uploads/1/3/4/5/134584073/6089651.pdfIn PDF document text
    • https://sonodube.weebly.com/uploads/1/3/7/5/137517068/kawakifatabepit_kukefo.pdfIn PDF document text
    • https://bovimafeji.weebly.com/uploads/1/3/4/5/134598331/gotozojowuv-fafimabaliwe-jugidexotos.pdfIn PDF document text
    • https://vudefuzafovafid.weebly.com/uploads/1/3/4/6/134630521/6780213.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/78b6bbe6-789d-45d0-abe8-cfc90d68e54f/acurite_pro_weather_center_rain_gauge_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91040b20-854f-4c0e-a212-d15eabd95422/57435702161.pdfIn PDF document text
    • http://fixiguru.pbworks.com/f/pasipomapupuxixamewukibuf.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/f/buzaforimewoxaxir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d77dc6-96dc-4a46-9ad9-5a62e89c7b0a/40164971199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a1bf4a-4abc-4a47-8ee0-65a04986f644/35437869467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afaf8e89-1281-4179-883b-e74a0c511f41/41408747389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eedd765-e172-43b2-8677-933db683bb2c/xivatesod.pdfIn PDF document text
    • http://rizukokodi.pbworks.com/f/36424556702.pdfIn PDF document text
    • http://dupalalo.pbworks.com/f/15588298010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7e0dc3-7e60-43dc-be95-fc2e45041166/how_to_turn_on_nespresso_vertuo_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab4cbcd-9fae-456a-b003-9e56dda6a98f/how_to_stop_deep_freeze_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6431a79a-15db-49cf-b09a-6f38250ae300/sample_of_chemistry_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1139347-da27-4981-a683-ebec3df494de/american_gods_cast_mr_nancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b58a93-2de4-463f-9a7f-0cedcd8e1fd9/31067903858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ee0b0e-cb91-4c88-9bf4-3747f6c79401/74681957489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460adcd8-6ee5-4c92-b41c-d783fdcfbe77/autoskola_testy_odpovede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6660144e-d878-4ed5-aba8-667c2c3c1a91/nixon_51-30_chrono_gunship_watch.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_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 5340 bytes
SHA-256: cce849f4c9d1b29576ade3dc9b915021a101b0afe119507372606cc5b0aae203
font_01_sfnt_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 10892 bytes
SHA-256: a959422df502c7c0bbb4e9cc655553bb79982c133ff416eadb62a9cf03a1bc54