Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49a08494794920b…

MALICIOUS

PDF

88.8 KB Created: 2021-05-03 00:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1b260aa7dfb51be2f5880a1bfbc5cb6f SHA-1: 3cd444152b200ddc68d243cde834ecb77873b954 SHA-256: a49a08494794920bc08889ad0123b65896fc63d14c793f42c013eb290375de9d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jacksth.ru/strik?utm_term=how+to+become+esl+certified PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427103/normal_6069d3601c1d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409258/normal_5fee4f618b268.pdfIn PDF document text
    • https://vepiniripalur.weebly.com/uploads/1/3/4/2/134235349/8367630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382778/normal_606500235633d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_5fe954e783001.pdfIn PDF document text
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/lejewejisikogas_zegiwova_mumavabojari_xokev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488339/normal_6012b32c848b3.pdfIn PDF document text
    • https://mekuzawejonoma.weebly.com/uploads/1/3/1/6/131606345/zugelisakad-xitalovo.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/53667e84-44d7-4aa5-aabb-1522bd6b69fa/construction_safety_equipment_list.pdfIn PDF document text
    • http://beruraxawiloga.rf.gd/rokogaver.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/english_christian_songs_karaoke_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/missguided_high_neck_cold_shoulder_midi_dress.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/vegejaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c4967a0-1d81-4334-a71d-c93075e560c7/puragumiteku.pdfIn PDF document text
    • http://paserarun.rf.gd/nisetumividanutaz.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/former_barcelona_coach_tito.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/sifojisaxitulepakazonut.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 5148 bytes
SHA-256: b79b5531f7e7ee5aa3a5ce8821a77ff4836a7be673fe019063f7e54d126ab653
font_01_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 11192 bytes
SHA-256: fc66e5a90833930c7973778576a4280199d0a8a1646001abf44a3c01e1b0740a
font_02_sfnt_off0001409c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409C 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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