Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cda9e29eddbbf8…

MALICIOUS

PDF

80.5 KB Created: 2021-03-17 11:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c5b5b54d0f4eb3359aec2823f238c6c3 SHA-1: 496866b1af321414978a103afd9e41bbff9479e5 SHA-256: 17cda9e29eddbbf8b3f996edd400482496bbba7a749a69a13fb78fd23e479050
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to various domains, some of which are associated with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/123?utm_term=fractional+indices+tes+worksheet PDF link annotation
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/bigepubedi_xusawob_zixaw.pdfIn PDF document text
    • http://zerudomafiko.iblogger.org/two_for_the_road_full_movie_online_free.pdfIn PDF document text
    • https://fujareke.weebly.com/uploads/1/3/5/3/135391043/9f6224d043.pdfIn PDF document text
    • https://lujegasot.weebly.com/uploads/1/3/0/9/130969173/dec3b72fe.pdfIn PDF document text
    • https://nuvafuriwevejuf.weebly.com/uploads/1/3/2/8/132814848/kolikezipej-wivikiv-baluda-pubezu.pdfIn PDF document text
    • https://ninukiwipovesot.weebly.com/uploads/1/3/0/9/130969879/tomupewekiw.pdfIn PDF document text
    • https://tewosafaxuw.weebly.com/uploads/1/3/1/3/131379700/877281.pdfIn PDF document text
    • https://detimuveruriwus.weebly.com/uploads/1/3/1/8/131872178/vigetiratobelewuvexa.pdfIn PDF document text
    • https://nabikiwajozipaf.weebly.com/uploads/1/3/5/3/135391661/pipuvagiwaxibu_mawatele_wedanofemix_sakazo.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/tokimopolo.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/855af5ec-15b3-43ac-a684-f7da74f016ac/71992901464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e408146-811f-47f3-bb53-2efd4dbf2c84/dakef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ac9b121-5be0-4ee5-9bf2-322a9fc2a047/15695747173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acab8e97-9c6d-4dc6-9234-a381fbaae6db/38103363492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4097a9-e5b4-4b8f-bd32-2f088607b8e4/husqvarna_lawn_mower_hu775h_parts.pdfIn PDF document text
    • http://lenixad.epizy.com/creature_3d_songs_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c3ea11-ee24-4c29-9b4a-ff642c5769bf/ranivifapiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d73dd40-231a-421b-8d69-2d8a73db9564/fe_other_disciplines_review_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe165859-b83c-485b-9299-fbfa684f181a/bohemian_rhapsody_free_on_prime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2108a57-c2ca-4c78-b6a5-e3007470ec90/lanudewatujab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196e748a-1c26-46e6-a1e7-dfa2bf66f2be/john_deere_lawn_mower_for_sale_gumtree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc3e6d7b-48dd-4553-8507-a085387b7b92/pegunusesikuvuxirodagir.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010b2c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10B2C 23304 bytes
SHA-256: a95669f76bce36fe52f492bae5bee02a28bfbfbf7daa64936f3c2b9a7aaf5e0c
font_00_sfnt_off0000d621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 5136 bytes
SHA-256: 9d4475cb52f5a204dddabf58cabcbedce04dfe46d65e4fa489766052bd7d3e40
font_01_sfnt_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 10372 bytes
SHA-256: 95db3b178d30cfacd6f824d27f4c204296cc637861e586c0e5b2527bd3009b85