Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3196d23f1ed760…

MALICIOUS

PDF

67.4 KB Created: 2021-03-23 03:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: be7b401e4f20c54de93e3f9d19c352dd SHA-1: 9895863c3171c6d49afb3f09d5bd0e23bcd983a1 SHA-256: da3196d23f1ed760424ea5d606084c67364bae1bab8ec1b9624695591d66c3d4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://golowaki.ru/123?utm_term=guided+reading+activity+6-+2+history PDF link annotation
    • http://trening-ekaterinodar.ru/suntrust_international_wire_transfer_swift_code9bnc5.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/LijVzma/arya_movie_songs_tamil.pdfIn PDF document text
    • http://leree4.club/the_merchant_of_venice_summary_act_1_scene_39rczz.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/gienx1O/apps_coupon_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_5fd5fd69e9570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_603c3c82cfde4.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/a9he6Ku/gerukawixuzave.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/hgq0gii/xebosexokowafevemu.pdfIn PDF document text
    • https://cdn.sqhk.co/mojerakikav/lxNgghb/11300559275.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/amIQZKb/earn_to_die_2_exodus_part_2_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_601936420e6fd.pdfIn PDF document text
    • http://shoop-fg.ru/14481263302mox01.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/VJpheif/laxodog.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/bjdjhfL/33941813772.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_b599215513584296a153194188b95962.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_577e948780df43548fffc2db81358fa7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d71fdc7c-18e2-4e7a-9015-e1368de6bea2/32037826484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249a6347-f9fc-4594-a7d2-1d171dc60c4b/the_professor_and_the_madman_reddit_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264b569c-ac0f-42bd-ac01-678fcad4fda8/miwukeze.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_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 5680 bytes
SHA-256: 80455fa6e1fe6037236140f80693aef4526a98585d7b60d83d6488d028e5ec18
font_01_sfnt_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 9548 bytes
SHA-256: 342b653396aca1e50d5f7d7487ce9e62a07fd6e943d84d3e95d8920faf9ec3f8

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