Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fb814419506fd8…

MALICIOUS

PDF

80.2 KB Created: 2021-03-18 11:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 73754b1a48d9b45e440e8dc954a6fdfc SHA-1: e8c09690b349bb2458cfc7a706e966cbc0ceaccd SHA-256: c6fb814419506fd8277051276da75e3664bb94193e50c7d93e4a871ae4835a76
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, identified as a link farm. The primary URL, 'https://dugedepap.ru/award?keyword=adverbs+of+degree+worksheets+pdf+with+answers', suggests a lure for SEO manipulation or potentially phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/award?keyword=adverbs+of+degree+worksheets+pdf+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411916/normal_602da3fbae3b7.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/besobifalebupimelomi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455681/normal_5fee300551082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_6022d03611307.pdfIn PDF document text
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/272427.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/toefl_model_question_paper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460473/normal_6052a5bc9b636.pdfIn PDF document text
    • https://miravavomi.weebly.com/uploads/1/3/1/4/131410597/4744424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388283/normal_6026bdc15fc4a.pdfIn PDF document text
    • http://movizopolu.medianewsonline.com/elan_touchpad_driver_windows_10_toshiba_download.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/cbae29a9-3905-4c2d-be3a-d0c0c86ad63c/3_types_of_illuminated_manuscripts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8e028f-375a-40f2-9e51-545292ace2ac/navesewobelegodenuxigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9059df81-cbb9-4505-ab51-aab792ba4a81/kindle_3_wont_charge.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_f4e185e2b9cf4cf1a27fbb86f26e4ba8.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_427da9131eab4510a7b617bd0c7ad786.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_12925af5794841308f0e034dc1bedd52.pdf?index=trueIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_e98cf9e5bc2a492fa0be33356fd779dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c848b9-244f-4db3-91c8-6ebbd59e174f/ar_15_10.5_in_pistol_in_texas.pdfIn PDF document text
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_443cb2228ebb45f0b88c3f01746024b4.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_c82850936b6c4c9a8631b6aa7f571ad1.pdf?index=trueIn PDF document text
    • https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_88a39495845d43948ee3cf2fabbe432c.pdf?index=trueIn PDF document text
    • http://rixibedi.onlinewebshop.net/dimulamemotulatitojal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2a6d65-27d7-4bf1-918c-eb046e67c9a7/is_mowgli_an_indian_name.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_b3acda29e2f044c7869a434d2152c7d0.pdf?index=trueIn PDF document text
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_d8c8ddd972144f629d7d36913fedc3ee.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 5616 bytes
SHA-256: 61e5807f3e42519e55069c0bbe0a26f0b5de6b70efa8f7375132d479bc373962
font_01_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 11072 bytes
SHA-256: fc9ea2cb67580eb4c63f468b10de0bf972a064f523ee9cd020e5c74bd56b322d

Open this report in the interactive analyzer, or submit your own file for analysis.