Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fa34cc2589b8e6…

MALICIOUS

PDF

69.5 KB Created: 2021-04-08 03:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8a8691614f68933186798320562d9cda SHA-1: 9115a48ec7b9616c29383ed94790dd19799dc168 SHA-256: b5fa34cc2589b8e6930f3129e88f43f5c1c89b16baa3bd44a5e392a1fd7ce9e6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=1000+places+to+see+before+you+die+daily+calendar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489844/normal_60469a524a8cb.pdfIn PDF document text
    • http://rezokivi.medianewsonline.com/spiderwick_chronicles_field_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/jzcNidK/khali_bali_song_video.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/gQFijrG/pupinamadule.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/air_pollution_ebook.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/87159596415.pdfIn PDF document text
    • https://napuximijagebi.weebly.com/uploads/1/3/4/7/134766840/baffe67.pdfIn PDF document text
    • https://madaleva.weebly.com/uploads/1/3/4/7/134772198/8932747.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/cUMhiTX/bejeweled_blitz_on_facebook_not_loading.pdfIn PDF document text
    • https://fonabanobegax.weebly.com/uploads/1/3/1/6/131636781/615b85be6c7.pdfIn PDF document text
    • https://fazinetogoxuv.weebly.com/uploads/1/3/5/3/135383047/4b0124c9ec875.pdfIn PDF document text
    • https://gunowiwusofemu.weebly.com/uploads/1/3/4/7/134705227/033a1704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_6059051b5b3d8.pdfIn PDF document text
    • https://dukozajaxal.weebly.com/uploads/1/3/4/0/134017298/4017480.pdfIn PDF document text
    • https://lolivifi.weebly.com/uploads/1/3/0/7/130739590/f8b3f2.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/32c6e392-0ab3-42d5-b028-214d99b825e0/history_of_islam_in_urdu_books_free_download.pdfIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/where_to_buy_a_treadmill_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b800aa-b86f-4b81-94df-f6cf768870e4/the_mysterious_benedict_society_show.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_off0000cfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD7 5488 bytes
SHA-256: a698d0d4661d2cf96b22226fd0e9f7c4be9d15ceef94c954826b6ac58d6d5581
font_01_sfnt_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 10720 bytes
SHA-256: 56f46329eae179435ddcce3ec94836b85e0e1146c0b5d4830a16b79c0e629fd6

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