Malicious PDF — malware analysis report

Static analysis result for SHA-256 a273c6e0953a538e…

MALICIOUS

PDF

73.1 KB Created: 2021-03-30 13:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3fc55b0110faf37ff7498aca73ca8e36 SHA-1: 93c046ff421f6b33f60f2e88c1bede5b1951611d SHA-256: a273c6e0953a538eb15d72f782700120d8cbbfb90ef052bf710bf431085abd70
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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/award?keyword=civil+engineering+drawing+pdf+books+free+download PDF link annotation
    • https://dadizatutelebi.weebly.com/uploads/1/3/1/0/131070904/aa6bf8.pdfIn PDF document text
    • https://zafatuxowusetex.weebly.com/uploads/1/3/0/7/130739053/kebowilis_bidokugodakifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448121/normal_5fd12959462cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394066/normal_6033d91bd425e.pdfIn PDF document text
    • https://noguzijevamemid.weebly.com/uploads/1/3/4/8/134890426/ritexixaderovifiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_6033c53c1197b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369161/normal_5fc69a47adc4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fe89615cc5e8.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/6gdjj0m/xufobenuzoramojemokitiv.pdfIn PDF document text
    • https://vegilumos.weebly.com/uploads/1/3/1/3/131383621/de0f6c85c7c8.pdfIn PDF document text
    • https://fabirakarag.weebly.com/uploads/1/3/2/7/132710689/2418005.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/djahfqu/find_a_way_addictive_puzzle_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newebujogunorer.epizy.com/crabbing_reports_nj.pdfIn PDF document text
    • http://refivofej.rf.gd/nukofidinilifubuzip.pdfIn PDF document text
    • http://dipodowimovaxi.epizy.com/smart_women_finish_rich.pdfIn PDF document text
    • http://pakatikik.epizy.com/free_printable_phonics_worksheets_for_3rd_grade.pdfIn PDF document text
    • http://jorowiwiboxizuk.rf.gd/heating_curve_practice_problems_with_answers.pdfIn PDF document text
    • http://bosirizowu.rf.gd/riditogowuno.pdfIn PDF document text
    • http://favugilodufim.epizy.com/english_words_meaning_in_urdu_list.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_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 5468 bytes
SHA-256: 5658c981cc02bca651d48e7681e520de62ad8a728f6b11f304f8fafe9a4260e2
font_01_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 11504 bytes
SHA-256: 12e80d13544e393a86a4d29b93fc6dd6353eb920fc9852460280efced049f24a

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