Malicious PDF — malware analysis report

Static analysis result for SHA-256 432f09c642694bc9…

MALICIOUS

PDF

79.7 KB Created: 2021-03-16 22:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8f9269e445963913abf634423979ae4c SHA-1: 9371c6208021bddf10d787e0aeb60af5967617c4 SHA-256: 432f09c642694bc98cdaea896cc1af4ad752fc342a1d5c38978e9684729a8154
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 0.9996

Heuristics 6

  • 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.
  • 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://nipisod.ru/wix?keyword=easy+way+to+teach+subject+verb+agreement PDF link annotation
    • https://cdn.sqhk.co/ralapogifur/jiheFGt/62630009538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_5fd67b38380c0.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/Shjjjho/top_scorer_2020_epl.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/figukofixavasu.pdfIn PDF document text
    • https://cdn.sqhk.co/pininipata/whe5jid/73100771066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449012/normal_5fd1bac1f2e36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_60342c75badd8.pdfIn PDF document text
    • https://maxamiboxu.weebly.com/uploads/1/3/1/6/131607029/jeruvupola.pdfIn PDF document text
    • https://lotekine.weebly.com/uploads/1/3/1/3/131381428/9134898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_601d1686ba66b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457881/normal_6009969bd34e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469359/normal_600f6332537d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483589/normal_602a7c705d88d.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/ajcidgj/28977179703.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/ayphcKc/nikko_air_elite_115_battery_life.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504870/normal_60029dcdd0428.pdfIn PDF document text
    • https://cdn.sqhk.co/kitatoze/jhhgghc/70420492485.pdfIn PDF document text
    • https://cdn.sqhk.co/vumajotiwog/b9gj0Yf/dictionary_merriam_webster_download.pdfIn PDF document text
    • https://fepafevadaxajaw.weebly.com/uploads/1/3/4/0/134095897/0e845c2db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8c7eb4-1e48-415b-83c0-f9de68fe705d/what_is_work_measurement_and_method_study.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb6509d-154a-493a-affd-f06c8f69b930/xamozojesekukete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7cf927-dd01-4dca-b6d4-8345ae3f04f5/23556259188.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_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 5608 bytes
SHA-256: 8e3724d0ca66afc4bdd1cba69470edaba518c7cf8e379501197cb59e1e7998a7
font_01_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 10788 bytes
SHA-256: 66b59a6e4cbeeb3b29e6c9f1129647218945542654274773644578aef5973367

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