Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce174628e599b5b…

MALICIOUS

PDF

77.2 KB Created: 2021-04-30 21:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fb8dca9e4ad3d54200544a63f01d040e SHA-1: 37946c986fb929e6ca4dd8002b11538b43a23515 SHA-256: 7ce174628e599b5b69073dfa02c96d8ba7604cb4a5b60b7beaed35f00684b500
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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/strik?utm_term=minn+kota+riptide+ulterra+for+sale PDF link annotation
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/409320.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/21190309249.pdfIn PDF document text
    • http://poopo.ru/why_has_my_samsung_freezer_stopped_workingac406.pdfIn PDF document text
    • http://kfcrabota.ru/milk_adulteration4u6to.pdfIn PDF document text
    • http://digovin.getenjoyment.net/how_to_gain_weight_for_blood_type_b_positive.pdfIn PDF document text
    • http://vapabamulu.22web.org/caroline_o_mahony.pdfIn PDF document text
    • http://airet.space/always_do_your_best_definition6mbl7.pdfIn PDF document text
    • http://hotel-engels.ru/3610551286klnkj.pdfIn PDF document text
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/vumepugikerelutikoni.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/ygs_saylar_km_sorular7i8ao.pdfIn PDF document text
    • http://gugaferur.22web.org/51794122835.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_9f5805c9f5974736be7fb8340004e92c.pdf?index=trueIn PDF document text
    • http://gebuzabode.epizy.com/basic_medical_terminology_list.pdfIn PDF document text
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_dbed147fdad84007af7a59efd4e36b0b.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_9809cf8e3a8d4b8aa155d87e82c670ec.pdf?index=trueIn PDF document text
    • http://neduweleviwov.rf.gd/words_that_start_with_cogn.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_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 5104 bytes
SHA-256: efe7b70920b074c75413fd87ed6ae6936426c310e3ff66f71f256c3ab8b10200
font_01_sfnt_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 11240 bytes
SHA-256: a23d1373be101bc366c434da79a5a48ac2df4a5e549034f308905ae6c4222c1b