Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5a65890c0f7325…

MALICIOUS

PDF

70.1 KB Created: 2021-02-09 20:51:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ce7e35b607589a332ef80c8cd163faec SHA-1: e27c18f3d0034a7e32435b5ec95a5b82e243f7a3 SHA-256: de5a65890c0f7325b087ad5d608ec8cec2068721f64d3dcaeed27be94b15ff12
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one, 'https://crophysi.ru/123?utm_term=plural+form+of+biases', being part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/123?utm_term=plural+form+of+biases PDF link annotation
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/4ff746f536.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366976/normal_5fff69efc0492.pdfIn PDF document text
    • https://vudemigubujesi.weebly.com/uploads/1/3/5/3/135300151/baruben_zefakelisi_wademip_wewamenudixe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370087/normal_6008f88aab9ba.pdfIn PDF document text
    • https://kabuxezalexafa.weebly.com/uploads/1/3/0/8/130814122/5232609.pdfIn PDF document text
    • http://trikolor.site/42567657089o63ml.pdfIn PDF document text
    • http://starconflict-game.ru/500_poses_for_photographing_couplesoemw6.pdfIn PDF document text
    • https://pobozopidukav.weebly.com/uploads/1/3/4/3/134384736/2133129.pdfIn PDF document text
    • http://pexiwaz.iblogger.org/adjectives_key_stage_2_worksheets.pdfIn PDF document text
    • https://punizino.weebly.com/uploads/1/3/4/3/134327780/4033190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_6007383aae44f.pdfIn PDF document text
    • http://zathkatow.xyz/elsword_demonio_guidepsu4a.pdfIn PDF document text
    • https://cdn.sqhk.co/vomikigiw/SDkFzhc/4546707057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fizaxo/learning_outcomes_internship_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/excel_templates_weekly_planner.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/7_years_old_song_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/53038063565.pdfIn PDF document text
    • http://mogopubu.epizy.com/applied_behavior_analysis_cooper.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_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 5052 bytes
SHA-256: 8c6c0c01825ad96b64302f07ba926665bbcf20a14da9d73eecc3dd68b1795e37
font_01_sfnt_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 10780 bytes
SHA-256: ca63af26785bf77f6fdd08eda99184f63f992cf6d015be4f033ab5a7c0a3df23

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