Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd2e7352a982500…

MALICIOUS

PDF

68.1 KB Created: 2021-02-12 23:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 771a1f1090ebb1600ada82d228350c17 SHA-1: 103e7e0fcc9b58428a7f74a9140df7d906b97624 SHA-256: afd2e7352a98250051d5750ba745bbdd088822d7fa202dd97939532d4e5a2388
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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
  • 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/wix?keyword=august+2017+algebra+1+regents+conversion+chart PDF link annotation
    • http://makululi.iblogger.org/30062108460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_60198c97383f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_5fe8f5b02a6b0.pdfIn PDF document text
    • http://kurewegunopef.66ghz.com/42794787530.pdfIn PDF document text
    • http://nowojikowelox.iblogger.org/breeam_international_new_construction_2016_technical_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408335/normal_5ffa9d808f882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482424/normal_601a55c540be6.pdfIn PDF document text
    • http://my-favshoph.online/jojo_part_5_op_2_download8u250.pdfIn PDF document text
    • http://gogotmif.space/lipekitods5oyk.pdfIn PDF document text
    • http://mebelintera.ru/horse_coloring_books_apps19lmm.pdfIn PDF document text
    • http://finovadi.iblogger.org/94014363417.pdfIn PDF document text
    • http://purpless.vip/interrogative_adjectives_worksheet_answers4yhgs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipudovisubu.rf.gd/adaptec_6405_manual.pdfIn PDF document text
    • http://moroxite.epizy.com/top_shooting_games_for_android_online.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_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 5656 bytes
SHA-256: 48067509b1109022645db706949f06156b962829dc6e72c51358396f85a5f49e
font_01_sfnt_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 10016 bytes
SHA-256: 8828e2411621a7dca43fe9233f22cae77801d4d62d62b403b6a77aa43e1fc434

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