Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6655416c99a544…

MALICIOUS

PDF

78.4 KB Created: 2021-03-15 04:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9e962c544a7ce9a1684430c7bbb9ecea SHA-1: 503cf448c78383bdb838878faed8d247bdba7fb3 SHA-256: db6655416c99a544a2844f58c9c7b688b6191950bade354c2b7d4c22536d77a7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://xajibur.ru/wix?keyword=distance+formula+worksheet PDF link annotation
    • https://cdn.sqhk.co/fefoseto/joXMjgu/jepubumisikimitikesam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_5fe337bb0ff43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_600c1343347d3.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/iheifzQ/ufc_fight_tonight_time_usa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_6029e48b6bf55.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/f04ihL7/shaolin_kung_fu_training.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/piNjajd/59993091801.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5ff3017a07b64.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/0BqgfXr/car_parking_multiplayer_online_problem.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/Shfiets/island_king_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/bivosozos/djjabhf/20293850681.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/ghLfYC9/creepypasta_amino_quiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_9efcea449f374380a27410cbc0604693.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2e436d-b3ec-400a-8f04-8a940142184e/introduction_to_cancer_biology_hesketh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a255925-5824-4032-a895-781dfe692259/vosesujisufuwexilof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2adfba-fc6c-4e84-a634-685e4bd3cfd6/ladadiwivibeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b4ab9e-4af7-4515-8b6f-34827f372518/34895147094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb227ee-492d-447a-8e4b-f777bf4be1a6/89855079639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e336c15-ebe4-4291-8919-582edc9b8b16/face_mask_frame_3d_model.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_8f7898e853074c7d87b514cb1c9c2543.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2034f8-9183-442a-bdbf-21ddb36becba/types_of_electrical_wiring_devices.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 5276 bytes
SHA-256: 9ad2c2ca2f0ae320ff92b5e2afbb945a0636eb2bf176a09d22f59194e2cfe67e
font_01_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 11076 bytes
SHA-256: e98edcbe72b276299549dab98d0e75a976da9daaf9c74a7cba93387c8ba853c1
font_02_sfnt_off000116bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 16096 bytes
SHA-256: 2dff1fc3e5bf1049a512ca2ab3d4448021a5e4676c0c9a63fbc3d390c83797d9

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