Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0a6c0b7c5240e7…

MALICIOUS

PDF

82.1 KB Created: 2021-03-01 20:18:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0c171df1790c903156a4155c2b987fe8 SHA-1: 2096a327bfefea72def04b9eaecbd002850fd9d2 SHA-256: da0a6c0b7c5240e70aa708131091d89dbdda124bce65322d4b33d6eef9421e87
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

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://gimoguvi.ru/123?utm_term=is+shark+vacuum+a+british+company PDF link annotation
    • https://panezoso.weebly.com/uploads/1/3/4/6/134697542/nulorexa.pdfIn PDF document text
    • https://doparobisupof.weebly.com/uploads/1/3/5/3/135329684/bosowudojiwadanelibe.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/jenkins_dotnet_core_3.1.pdfIn PDF document text
    • http://sacredname.ru/shadowrun_dragonfall_character_buildr1lc6.pdfIn PDF document text
    • http://e-devletodeme.net/ecommerce_website_templates_free_phprvurb.pdfIn PDF document text
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/276491.pdfIn PDF document text
    • http://gonisavuxur.iblogger.org/22671590043.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/madezazadezolalatapugepa.pdfIn PDF document text
    • http://xevidome.iblogger.org/68650374782.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/craftsman_13_planer_parts.pdfIn PDF document text
    • http://usacreditmonitoring.info/learn_japanesex6d1m.pdfIn PDF document text
    • https://tirasuvemesamu.weebly.com/uploads/1/3/4/6/134672388/zutorenuliguzuzad.pdfIn PDF document text
    • http://nuverlites.online/rejifanozuru73617.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://donolipapaxe.rf.gd/reading_comprehension_worksheets_for_2nd_grade_printable.pdfIn PDF document text
    • http://juxugalipexobow.epizy.com/tokenemusagifokulema.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/zonejosejoxeler.pdfIn PDF document text
    • http://rutuvofogiseba.epizy.com/arduino_mega_2560_rev_3_datasheet.pdfIn PDF document text
    • http://tasopawak.rf.gd/how_to_season_a_vertical_charcoal_smoker.pdfIn PDF document text
    • http://supidanerij.epizy.com/ambiguous_name_detected_worksheet_change_vba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 5208 bytes
SHA-256: cde77662439c0d715f6bba075f017ede5fe118d5209a2f6bde7e9bc21ecca681
font_01_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 11004 bytes
SHA-256: 5b80ef9c74fec1d4f569af7735f4eda421bc1aaa4d2696b2a207a16b70ae5cb8
font_02_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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