Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb552b104cc3792…

MALICIOUS

PDF

80.1 KB Created: 2021-03-19 16:55:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 341fdaf3ddd70e23836777bf8bf85547 SHA-1: a3f6c3a29d211233837b80f07cf32de3f14b165c SHA-256: 9cb552b104cc3792a4fd87d452df84159203bc81f5868c2ca9fd56be91089e45
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/wix?keyword=kate+bornstein+my+new+gender+workbook+pdf
    • https://kawuzuke.weebly.com/uploads/1/3/1/6/131606938/8930849.pdf
    • http://lnstagramverifiedsbadgeforms.com/69714145713zcybn.pdf
    • http://inmyshtangen.xyz/how_much_child_care_workers_get_paidciajz.pdf
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/suxogeragat.pdf
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/5637354.pdf
    • http://craftsmansmetics.com/tennis_elbow_exercises_australiakbz2k.pdf
    • http://tameenegypt.com/what_is_dialectical_behavior_therapy_for_borderline_personality_disorder7mkrd.pdf
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/nubuv_riravoseri_mogirawokase_namerawu.pdf
    • http://nekuwagibajese.getenjoyment.net/bathukamma_songs_lyrics_in_telugu.pdf
    • http://rebelliona.online/oracle_12c_client_download_for_windows_10_64_bityz0cj.pdf
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/7196230.pdf
    • http://kalidejomepajo.scienceontheweb.net/how_to_be_smartest_person_in_the_room.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8585456c-d619-4d01-bc5e-b0f8e8ac770e/66247044442.pdf
    • http://xenexafa.myartsonline.com/tezakelufe.pdf
    • https://uploads.strikinglycdn.com/files/3669f1c5-2f95-44ac-a033-5a88f87e640f/pujufamijifuzepigofirino.pdf
    • https://uploads.strikinglycdn.com/files/615a5c59-0757-4b72-8818-219f0ebd1e02/rogarirokugowilavizusanop.pdf
    • https://uploads.strikinglycdn.com/files/d9b714ba-80ba-44d8-a4ce-acd18c4198b3/20931489259.pdf
    • https://uploads.strikinglycdn.com/files/14573fc8-db73-4d78-8854-03814ae54b65/26498924792.pdf
    • http://vujijemu.atwebpages.com/93228421758.pdf
    • http://xawixojupaxixan.onlinewebshop.net/vutefibo.pdf
    • https://uploads.strikinglycdn.com/files/d4c475b4-46c4-4c5b-aea6-7b4a757e4270/yamaha_htr_5930_review.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_off0000f603.bin
41e7e26e3bf1f59ed46da035e98833eac42e03907738b1a4fc042f0abf6f3ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 5696 bytes
font_01_sfnt_off00010967.bin
27f4bf41b20556ce965b9a66b916cff50292a715778b6ab15468314ebebcc64f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 11552 bytes

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