Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd8f6c0c1ebb3fe…

MALICIOUS

PDF

70.7 KB Created: 2021-03-28 14:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ff7391a0055b12e919e6aaea449d8d55 SHA-1: e005b1392c7b2e69082f7f5f8a982ff04fae609b SHA-256: 5dd8f6c0c1ebb3fed03df436350bcf9edd9abe6b6516f319b551a5d0eb84c842
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDFs hosted on various platforms. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to manipulate search engine results or redirect users to malicious content. The presence of ClamAV and ML detections further supports its malicious nature, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/award?keyword=carslaw+jaeger+conduction+of+heat+in+solids+pdf PDF link annotation
    • https://komamizidunip.weebly.com/uploads/1/3/1/4/131437982/34aebd95b8415a3.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/icjbPie/lenupabav.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/ihCZghd/45199129452.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/chcaIhd/grass_cutting_service_names.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/Hnicjad/refulogivazofaxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504791/normal_602f740d7469a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_60530f9ca128b.pdfIn PDF document text
    • https://sinitilelimokiz.weebly.com/uploads/1/3/4/3/134348988/sazobujiwala.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/g5if4gi/voice_recorder_echo_effect_android.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/YAihigy/55022811915.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/hqhcNhi/the_vocal_coach_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449205/normal_605cc1ffe1d9b.pdfIn PDF document text
    • https://fodivavix.weebly.com/uploads/1/3/1/4/131483454/6113124.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/Oge7LUH/berovobebuseketuwole.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/jroDegj/swing_shift_jobs_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/phbgj1e/81097206929.pdfIn PDF document text
    • https://xoretesani.weebly.com/uploads/1/3/4/3/134315313/5912251.pdfIn PDF document text
    • https://cdn.sqhk.co/furabafezuse/hcOihjf/71772222256.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/e9b3d7da-0aef-4246-82e9-abd5bdea9543/finding_the_area_of_parallelograms_triangles_and_trapezoids_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9318ea4f-ecc4-4c64-a283-e2c4ed315691/atonement_ian_mcewan_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93fab3c-ad77-48bc-aeb2-d7ede7b365b3/nadenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5172a53b-f4c9-4a88-b717-454087c4d786/gitifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ff491e-7bea-49de-85f1-889b2efe4060/final_fantasy_x-2_ps4_trophy_guide_and_roadmap.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_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 5488 bytes
SHA-256: 225124617de70eb4031f2f2e7d81506512b9edd4cfb0fd39ff52fbb02698b735
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 10532 bytes
SHA-256: 2858f191c10ae93fb112d400823aedeff62b927b8f9f1bb3ee5f48c5d92cdaca

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