Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63782cd5c0920aa…

MALICIOUS

PDF

74.9 KB Created: 2021-03-24 11:30:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85e39e12df638f367f2096fd9fc40f57 SHA-1: 7334ff64f3ac3d56cd56cb8a0b249de53cc7b163 SHA-256: c63782cd5c0920aa630daae3f5cb2cfb523881e32377fb46a5de322484257b48
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it's part of a link farm or SEO manipulation scheme, likely designed to redirect users to malicious websites. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' further support its classification as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=por+que+no+los+dos
    • https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/c58a4d6756339.pdf
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/4885047.pdf
    • https://cdn.sqhk.co/vavetiset/hYihNZP/nosik.pdf
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/lesezag-bimizogubites.pdf
    • https://vonewujin.weebly.com/uploads/1/3/1/3/131380349/turoze-sugipezefeg.pdf
    • https://rupijike.weebly.com/uploads/1/3/5/3/135312351/981565.pdf
    • http://navevukosuso.mypressonline.com/transportation_business_plan_example.pdf
    • https://mujamixoto.weebly.com/uploads/1/3/0/7/130776872/sarasimasojeso-xufexipomig.pdf
    • https://cdn.sqhk.co/famuxina/ehfFAgf/90810479568.pdf
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/gaxesabiwujo.pdf
    • https://dalokagamamis.weebly.com/uploads/1/3/4/6/134695183/xotawozivevokixig.pdf
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdf
    • http://xidufefonudug.sportsontheweb.net/toyota_camry_maintenance_schedule_2011.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zupitatip.atwebpages.com/44617718108.pdf
    • https://uploads.strikinglycdn.com/files/30f8485b-47e8-4252-9885-86595b0d13ff/is_harry_potter_cursed_child_going_to_be_a_movie.pdf
    • https://uploads.strikinglycdn.com/files/6389e4f2-759a-4807-b473-1432f2c21553/zuvepufiz.pdf
    • http://padusij.onlinewebshop.net/neurofibromatosis_pediatria.pdf
    • http://dapibudajemuk.atwebpages.com/53999173897.pdf
    • https://uploads.strikinglycdn.com/files/8d677fa9-ae38-40b0-9757-e499b20946db/wendys_breakfast_burrito_nutrition_information.pdf
    • https://uploads.strikinglycdn.com/files/3c447a78-a502-4569-bb48-a57903d551a0/firefox_47_portable_32_bit.pdf
    • https://uploads.strikinglycdn.com/files/03133dee-bdbe-462d-9018-e425a4b751ab/scotts_riding_lawn_mower_17hp_42_belt_diagram.pdf
    • https://uploads.strikinglycdn.com/files/d5347ae5-27ce-4374-b431-f29665f5ec84/engineering_drawing_basics.pdf
    • https://uploads.strikinglycdn.com/files/c9593630-95c9-4a37-952a-abcb25d735fe/bose_wave_music_system_iii_cd_not_playable.pdf
    • https://uploads.strikinglycdn.com/files/73daf22a-79c1-4c79-98e0-7a5da938a623/navoranorosob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e770.bin
1ce48a516a0cbb26d4b2abdc7cebfd43b64f8c439ab5adb417b8b2d5981796a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 4736 bytes
font_01_sfnt_off0000f793.bin
36d3cd9bf09796cf4ec86c99c818da5216b70fe82a1d662bc7691afe4cd80b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 12076 bytes

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