Malicious PDF — malware analysis report

Static analysis result for SHA-256 2932709fa230eecf…

MALICIOUS

PDF

75.7 KB Created: 2021-03-05 23:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 478e3b8f15bc501e257d560a68ae552d SHA-1: c67b4656f020a08b6911891a840c26bae386b72a SHA-256: 2932709fa230eecff28d95c20a734d23227d8227e8da4339f0568e5ae3dce3f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a large number of external links, with one pointing to http://sunepoxuvigos.66ghz.com/60666373123.pdf, suggesting a link farm or phishing campaign. No scripts were extracted, but the PDF structure itself is being leveraged to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://bologen.ru/wix?keyword=jin+zhang+dds PDF link annotation
    • http://sunepoxuvigos.66ghz.com/60666373123.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475215/normal_5fefee46751f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369511/normal_5ff62b8c23272.pdfIn PDF document text
    • http://bigswinner.space/kung_fu_panda_3_soundtrack_listh0zkc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5ff3ac0b8f3db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420588/normal_60017c1f1fd95.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/farojuducnzio.pdfIn PDF document text
    • https://lufeziwupidel.weebly.com/uploads/1/3/5/3/135345985/nerodekexizi_wariku_xifitivoz.pdfIn PDF document text
    • http://springtea.space/proper_way_to_wear_face_mask_pleats_up_or_downnhw5s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5ff4328cba2f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464523/normal_5fd6d98a9c7cd.pdfIn PDF document text
    • https://gafapelisepofas.weebly.com/uploads/1/3/4/7/134762307/5801645.pdfIn PDF document text
    • http://kedejusofapirej.22web.org/degudaxugaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_5fd128e6cf8b1.pdfIn PDF document text
    • https://zasoliwex.weebly.com/uploads/1/3/5/3/135318241/xivenaziz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460473/normal_5fde4d20cdee4.pdfIn PDF document text
    • http://trysalon.xyz/64487157096hdi1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_600f4276511dc.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/44f744b1-4bdb-4c79-a227-9ca178e078ad/joxovowufunexum.pdfIn PDF document text
    • http://jejotatimub.rf.gd/52930839134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a9e5b0-7093-45b3-ae3c-c6d08f624248/assignment_03_en130_english_composition_ii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690c9e8f-588c-4fa8-af0b-0ff28077fcf1/biblia_en_linea_reina_valera_1960_en_audio.pdfIn PDF document text
    • http://suzokude.epizy.com/who_do_i_call_to_fix_my_washing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3b1b48-4f59-4c7d-bc1f-5af7cca96408/esl_public_speaking_lesson_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c649342f-f798-4200-9af9-67f170e273da/applied_physics_multiple_choice_questions_with_answers.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 5000 bytes
SHA-256: 8cf0845b0dbfcb10d5231d5b0aedddc14b8b8db9fbf54672684c566776a7c9d3
font_01_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 10144 bytes
SHA-256: f697e1b353fe6b545bbb2b98563f0485dc2f51ed984f4574dde1cb035ccf63f6

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