Malicious PDF — malware analysis report

Static analysis result for SHA-256 6357d05323c2ace7…

MALICIOUS

PDF

73.6 KB Created: 2020-11-26 00:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 571458ce543cac414ab77d71192282e5 SHA-1: b3650bdaa4290ac6b73fbc28620dbabe5a015570 SHA-256: 6357d05323c2ace7dbd2723e82367d95ef73d5c47fb5221b0b29b1fe21e1fc3c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a significant number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=barry+university+address+miami+shores PDF link annotation
    • https://jiwanozote.weebly.com/uploads/1/3/4/3/134354006/gazesapo.pdfIn PDF document text
    • https://niwurakoj.weebly.com/uploads/1/3/4/5/134588258/xufanemet.pdfIn PDF document text
    • https://gufamaran.weebly.com/uploads/1/3/4/0/134017683/kimijadik-joruvidadefo-notunix.pdfIn PDF document text
    • https://bapepewemeg.weebly.com/uploads/1/3/4/7/134702997/sulimok_gazafuxakeku_rusoda.pdfIn PDF document text
    • https://jikesekija.weebly.com/uploads/1/3/4/3/134367489/bf2ec373730d.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/4130a012120f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8f2c07-2bad-44ce-9ab3-4abaad29164b/unblocked_games_hacked_9001.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/92974432771.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/78614245634.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/puwosepiveronof.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/blood_on_the_ice_skyrim_examine_crime_scene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e56572-e939-400b-9651-3ef39b988366/esl_worksheets_for_beginners_vocabulary.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/sekixonefavok.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 5244 bytes
SHA-256: f5430f4c0f2fe2ae6ea5703df59913b31f46aadf3ab019dc7c6efbcee10c3fd6
font_01_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_02_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 10996 bytes
SHA-256: 44e4d0f977802618f8d1f2cad21e67c5cf944e95c921e2f8f7d12fee73018bfd

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