Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2408b1e0d2484de…

MALICIOUS

PDF

84.3 KB Created: 2021-02-20 05:08:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b00b49dd6c540ebe4a6c503ffb7b55cd SHA-1: 12737e142464b51414da348021d1dee21f7940c0 SHA-256: a2408b1e0d2484de4f6d6ea2b3c5fcdb8b00d1fe9c3772e3df9230312b73ba72
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure (https://yafferge.ru/wix?keyword=magic+binds+pdf). Heuristics indicate the document is a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the nature of the links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=magic+binds+pdf In PDF document text
    • https://cdn.sqhk.co/demejapad/jipDggW/old_shark_dash_cam_manual.pdfIn PDF document text
    • http://bivozebavi.iblogger.org/88628308360.pdfIn PDF document text
    • http://ledukamu.iblogger.org/sixomejajaver.pdfIn PDF document text
    • https://nozabuzewetuk.weebly.com/uploads/1/3/2/6/132683147/2428857.pdfIn PDF document text
    • https://sufepupebesi.weebly.com/uploads/1/3/4/6/134636280/xupeweb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_5fdf9fe5972e3.pdfIn PDF document text
    • https://pisiteju.weebly.com/uploads/1/3/5/3/135314571/rikudikuvijex_nejalonobis_wekem_giwimerojev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5fdc6f7118c36.pdfIn PDF document text
    • https://cdn.sqhk.co/xixofivib/dVwAmzN/88537892729.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/ifUhhPX/97769592428.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/daGhhRY/let_s_learn_how_to_draw_app.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/j84DmDL/server_manager_remote_desktop_services_collections_quicksessioncollection.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379380/normal_5ff047dda93ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408582/normal_60007fb71aaee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/bupebulid.pdfIn PDF document text
    • http://gujugune.rf.gd/ariens_520_snow_blower_oil_change.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/21320316833.pdfIn PDF document text
    • http://zumijuxuv.epizy.com/90952796106.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_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 5340 bytes
SHA-256: 4595e253b00d5bd9420bc82ae55e3ade209806f81c764bab20b1784a50d21e8c
font_01_sfnt_off00011fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 10240 bytes
SHA-256: 38d2d40e88d674c685a811a6818cd941523d7828cc0abb3a7c6bc1afe2dfca96

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