Malicious PDF — malware analysis report

Static analysis result for SHA-256 167e08bb79d45898…

MALICIOUS

PDF

81.7 KB Created: 2021-05-12 07:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6536e1d210358e4d08933c5ab71b03ba SHA-1: 003acf6fe57252d27689a86e53ea77864bd818b6 SHA-256: 167e08bb79d4589847360e6d683cd1285dbd088b420f610a579e1d0062293518
126 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as 'Pdf.Phishing.Trojan'. Static analysis revealed multiple external URIs, including one pointing to 'jottigo.ru' which is likely a phishing lure. The PDF also functions as a link farm, with many distinct hosts, suggesting an attempt to obscure the malicious destination. The ML classifier also strongly indicated maliciousness.

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://jottigo.ru/strik?utm_term=when+to+use+quotes+in+writing PDF link annotation
    • http://wemexuj.22web.org/75085323930.pdfIn PDF document text
    • http://fibened.22web.org/maxuluxujobexunuze.pdfIn PDF document text
    • http://20970907.net/rewikoposajopak8m5zm.pdfIn PDF document text
    • http://olx-delivery.cc/wimafubuwep54fry.pdfIn PDF document text
    • http://xexudoj.22web.org/commonly_misspelled_words_list_6th_grade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvemodu.rf.gd/solubilities_of_inorganic_and_organic_compounds.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_314fcdd96a864b749508b7e7cbcce362.pdf?index=trueIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_1d41395a2217436899a474ea36e2185d.pdf?index=trueIn PDF document text
    • http://roradom.epizy.com/sunsetter_awning_cover_installation.pdfIn PDF document text
    • https://765a5d72-5774-4a4d-a421-5c90307110ba.filesusr.com/ugd/f2a868_68b08aa5367444d4a9d4581c50778b01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac573b4-1a4d-4115-979b-112593cfa97a/zavawamapekipigixakige.pdfIn PDF document text
    • http://kilobawul.rf.gd/bronchopneumonia_in_adults.pdfIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_2b69605d308b490b95d7466775a3dcd3.pdf?index=trueIn PDF document text
    • http://pezomovororiz.rf.gd/59573343796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0906ff62-16d2-49d4-b960-89fd92ed45e9/51921649234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5789fc-bd15-4a3e-b8d1-7d87d1c149aa/how_to_tell_if_furnace_filter_needs_replacing.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_1832d37947db4a7bb72ccfc62986e2d8.pdf?index=trueIn PDF document text
    • http://zelibigevuloxuj.epizy.com/apprendre_anglais_grammaire.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_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 4936 bytes
SHA-256: abf7722987873ffecf697733ea343702203877dba24f3bbd2d71686eee79a2f1
font_01_sfnt_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 10756 bytes
SHA-256: 4645c304e1fa716d5e2fdb2b820a645689c7dc7ccb418028c8a5e14664371fd5

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