Malicious PDF — malware analysis report

Static analysis result for SHA-256 712839b2855320e9…

MALICIOUS

PDF

83.2 KB Created: 2021-03-22 23:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9e19cd068e18c01df2e9dfe621a2e901 SHA-1: f3da9804b66e53ddbd79bce91fe384bb205808d3 SHA-256: 712839b2855320e9d104622a402ebcdb26eb6da7efaf7ee73340c8b3d9a8b2a4
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://jacksth.ru/strik?utm_term=canon+20d+review PDF link annotation
    • http://world-wildshop.com/74046971265953qr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_604808d1de03a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_6023e4edc6058.pdfIn PDF document text
    • http://lofitner.buzz/citibank_credit_card_bill_deskaccv3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_600dedc04cec5.pdfIn PDF document text
    • http://optalpha.com/little_chief_smoker_recipes_jerky6rlz7.pdfIn PDF document text
    • http://titanof-filtr.ru/rusafasafonukotar0yrdo.pdfIn PDF document text
    • http://beststudent.fun/identifying_and_using_pronouns_worksheet_2_answersfdjzd.pdfIn PDF document text
    • http://goldalbum.ru/muzasukowalufinovikugefcsfhw.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/bissell_power_steamer_pro_deluxe_instructionsxcviz.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://uploads.strikinglycdn.com/files/ebefb3eb-a22a-4271-8285-8a61b891ea17/kagulonisix.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/regatuwomu.pdfIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_d8d958c8475648c9b47ce6eb0731b38d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e5fceb-b33d-457b-8b7a-1af1f0c27d79/zinizutezezosefiz.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_3bc9fdcb192747c0906fbe1913019aab.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_6e34ed958a7b4b61b9a17a59f510bfbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/720303d5-e534-4d2d-9ea8-0fe502e5ad2b/pass_rate_on_fe_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/template_ppt_pastel.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_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 4768 bytes
SHA-256: d6b52c1c932641b126902d2045186fa9b9c930cd9aa8f27669b14d4b05b5124d
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 11080 bytes
SHA-256: 1ff3b468c53f6ecc2da66bfa2212ae3224b77ba5a261632ef4e694c5a14fef7b
font_02_sfnt_off000131cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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