Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff3640ff5be00d6…

MALICIOUS

PDF

73.5 KB Created: 2021-03-15 18:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b785f8375cdccef9bfd3e98f385a0d7 SHA-1: 5e7228c6573777e2a99969313af838743d1355ae SHA-256: 3ff3640ff5be00d67abb80bbd6e1e9005d089d6c9e86be1d43a5baae08f7641c
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with the primary URL pointing to a domain associated with SEO link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=rc+model+airplane+design+pdf
    • https://nexirexosevexos.weebly.com/uploads/1/3/4/5/134500935/6632431.pdf
    • https://cdn.sqhk.co/pelotuwew/majaQWD/cnc_machine_programming_operating_videos_app.pdf
    • https://kuwupixunipava.weebly.com/uploads/1/3/3/9/133986845/3208791.pdf
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/169dc738e.pdf
    • https://cdn.sqhk.co/wefenilu/Ihdghha/dragy_gps_performance_box.pdf
    • https://cdn.sqhk.co/zujijivopuju/hbMwggL/how_to_get_1000_subscribers_on_youtube_fast.pdf
    • https://xefakiradu.weebly.com/uploads/1/3/1/8/131856624/c222d043440f534.pdf
    • https://cdn.sqhk.co/rapawaferew/ieziebE/54115600711.pdf
    • https://juxeduwabup.weebly.com/uploads/1/3/0/7/130775558/7918313.pdf
    • https://cdn.sqhk.co/mivadunoxo/MqjbiRL/libuw.pdf
    • https://bixugukov.weebly.com/uploads/1/3/2/6/132680808/xobipiguzejitezoto.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fejenijovekozu/1017687146.pdf
    • https://uploads.strikinglycdn.com/files/1ed98ce8-cd25-4c51-a129-5d7e673afecc/kenmore_elite_washer_and_dryer_combo.pdf
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_b8173a71c78f4012aaad9ab44aa65272.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3e0a2d26-376a-407a-96d9-64385f588cc8/xatawuf.pdf
    • https://uploads.strikinglycdn.com/files/d3380805-c0ea-439d-89a3-ebdaaa1eec6c/danby_dehumidifier_user_manual.pdf
    • https://s3.amazonaws.com/wifiduxezo/64435464982.pdf
    • https://uploads.strikinglycdn.com/files/45bc61da-09a9-495b-8834-37522306dbec/41339435546.pdf
    • https://uploads.strikinglycdn.com/files/f6e6227c-a9ae-4aeb-adad-629831544b7a/the_magicians_season_5_episode_10_promo.pdf
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_f8966f2429ae4b7e8476db66596ec424.pdf?index=true
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_4b74c28ca1fa4a5c837be9b7ca4f99b4.pdf?index=true
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_78a6b82f5c9c4d40a57b4f5ee687ba34.pdf?index=true
    • https://s3.amazonaws.com/faxaxos/75119307427.pdf
    • https://s3.amazonaws.com/levovod/15142160951.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6df.bin
fca02ce1bf143f4181150cc92dcb5615d7e08eb17e3b872de9b911ae88be45e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 1644 bytes
font_01_sfnt_off0000df1a.bin
322a4122125ac4d81e1e81ad93dd1f82d68974385377b361db56a30de8e09b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 5484 bytes
font_02_sfnt_off0000f1ae.bin
01ac8ed0c65bdc613be8c9832fb9abc5217fc74e27058f0c4d63d5e934023509		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 10792 bytes

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