Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32526e3d7846aa3…

MALICIOUS

PDF

90.6 KB Created: 2021-05-15 15:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 55033571dfdb2db96b582660b0319f79 SHA-1: cef009c826a1f531154f51f77bcb9a8903de8026 SHA-256: c32526e3d7846aa38f3fdf2d2e96d49402a3520b4c07f67703fc945f6ac5c245
156 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 0.9992

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://mezovuduw.ru/strik?utm_term=professional+ethics+gtu+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368248/normal_6044ca7cac791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459027/normal_5ff70c7ecd934.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/rE6geoM/27045351396.pdfIn PDF document text
    • https://laderorigeridag.weebly.com/uploads/1/3/4/3/134309938/4005104.pdfIn PDF document text
    • https://cdn.sqhk.co/dolavalof/iel7jeM/95197200565.pdfIn PDF document text
    • https://cdn.sqhk.co/neridisen/Wfjbigz/6235087868.pdfIn PDF document text
    • http://gonimuliveza.22web.org/80303541195.pdfIn PDF document text
    • https://derodukiv.weebly.com/uploads/1/3/1/4/131453370/fapedidevut.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/6071285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_605f5abf4761e.pdfIn PDF document text
    • https://cdn.sqhk.co/vugasoveg/jbZsZji/deepest_trench_in_southern_ocean.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/Q6qLvjj/elifoot_19_truques.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xonobijikivo/73429098826.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/samsung_convection_microwave_cooking_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/interview_questions_to_prepare_for_reddit.pdfIn PDF document text
    • http://wogirajixamaw.epizy.com/59075105168.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/cairns_tv_guide_monday.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/first_grade_math_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/78333774345.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/vilej.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/35358602181.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 5504 bytes
SHA-256: 167c84949db58dc08ec92f58f33d54d7a4c0dc2bfa97b19640fea4a81507a585
font_01_sfnt_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 5424 bytes
SHA-256: 7309f8ad222c80abf7c622366397eb78e8f362f149e4db8d9bd9611d66ea58d5
font_02_sfnt_off00012a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A20 10624 bytes
SHA-256: 1aa06cf4eace2a1bb357cdea825c9dc9917291028e0736d6c5e6433e3f8c7fca
font_03_sfnt_off00014e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E57 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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