Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e8acd50fe0a73b…

MALICIOUS

PDF

66.2 KB Created: 2021-03-19 12:35:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ac4c8a75d4f86af5ba592b890eb6d4fb SHA-1: 8c36c4fb90537bace8f65c0d05610c6290504141 SHA-256: 22e8acd50fe0a73b95b850e58b6ed5cc547da50318ca561baf76198549bfd0fa
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, masquerading as search results for a book download. The primary malicious URL identified is 'https://ponafet.ru/award?keyword=minimalism+book+pdf+download', which likely leads to a phishing or malware distribution site. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic to attract victims. ClamAV detection and ML classification further confirm its malicious nature.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/award?keyword=minimalism+book+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451567/normal_600d67c30c67d.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/INHrjeO/brhp_homes_for_rent.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5fcc9925c55ba.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/jcigEgc/uncertainty_definition_business.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421061/normal_5ff39cc256dac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_5fd68d5a0fa1c.pdfIn PDF document text
    • https://cdn.sqhk.co/nunexijezep/jajdK0p/spoken_english_video_lessons_free_download.pdfIn PDF document text
    • http://rusewigojubilon.mygamesonline.org/sense_and_sensibility_movie_watch_for_free.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/32173294117.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/guxosa/craftsman_10_inch_drill_press_laser_trac.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_ecaf9587fed745ae87cb1f1f199ce7b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/48837270503.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/rogew.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_bb4eb703b95f48eb9274ed60ae905207.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/crowdstrike_holdings_earnings_report.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/how_to_change_the_bag_on_an_oreck_xl.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/74038870072.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/66192282891.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/algebra_1_common_core_textbook.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_off0000c873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC873 5392 bytes
SHA-256: 10e3c8420dec65e0e7b80f2ec3383d9f11362db85667e79dee1d422c0f8a95f6
font_01_sfnt_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 9556 bytes
SHA-256: 72712efc03676154639f94c0ff21ec596723d822c4bfef38e7bb28dccc77edfb

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