Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8d27e5c2e2a9a6…

MALICIOUS

PDF

69.9 KB Created: 2021-02-12 20:25:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5e13311241cc8c6712bd5e8a037a9846 SHA-1: b9ee99b2ddc67d7971f357b23c14d3730d48cdfa SHA-256: 0f8d27e5c2e2a9a68d26467016642403fd4937521f1377ba2e47c0aabe22fe2d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://baarspo.ru/wb?keyword=writing%20two%20step%20equations%20worksheet%207th%20grade PDF link annotation
    • https://lodokevez.weebly.com/uploads/1/3/4/4/134476034/6995311.pdfIn PDF document text
    • http://xiwasaruv.66ghz.com/jeremivapalifugaze.pdfIn PDF document text
    • https://tuwagufo.weebly.com/uploads/1/3/3/9/133999840/zijodexip.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/jdgdjcK/79164160909.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/L5wiaii/71485408588.pdfIn PDF document text
    • http://dobikan.22web.org/5503834486.pdfIn PDF document text
    • http://jojonavakuxuf.iblogger.org/bloodborne_chalice_dungeon_boss_guide.pdfIn PDF document text
    • http://tukazijib.22web.org/golang_template_string_join.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/fieibgg/5147543061.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/jfA1WtE/28367500259.pdfIn PDF document text
    • https://luwagibefex.weebly.com/uploads/1/3/5/9/135966535/dabiwapakaderorebe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wufujudisu/86960012139.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/german_spell_check_word_2007.pdfIn PDF document text
    • http://madujiketowulat.rf.gd/6389926723.pdfIn PDF document text
    • http://niwuganol.epizy.com/83897361793.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/31745837228.pdfIn PDF document text
    • http://sedijinuv.epizy.com/nowuborumufej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D7 5448 bytes
SHA-256: ad6ebba0dd0c14294466b9b198ee8957f4c9947d984254d2b737923ffd241f19
font_01_sfnt_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 10452 bytes
SHA-256: f266455194be6fb26c8152d09a402222f1d2fbcd3fe7d1951243022f5a84a8e1
font_02_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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