Malicious PDF — malware analysis report

Static analysis result for SHA-256 3943dbefa604be7b…

MALICIOUS

PDF

80.4 KB Created: 2021-04-04 08:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 75682bba262f701dff8b911af873553a SHA-1: 5318a7f79d32681bc1028a973849f0b607375999 SHA-256: 3943dbefa604be7b0fbd4e198d1b16ada3e14539a453e70227e14b67ddaa969b
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 0.9991

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://crophysi.ru/strik?utm_term=drum+set+books+for+beginners PDF link annotation
    • http://wumewil.sportsontheweb.net/53682987539.pdfIn PDF document text
    • http://bepelisufozasep.mywebcommunity.org/bye_laws_of_cooperative_housing_society_thane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_6041f5ca97f9f.pdfIn PDF document text
    • https://cdn.sqhk.co/lakuxezaj/KwhgQcU/video_call_android_tv_box.pdfIn PDF document text
    • https://cdn.sqhk.co/potonefamuve/bidK6Uv/21384761825.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/jcRxxhf/48951208837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_60611b3777d66.pdfIn PDF document text
    • https://cdn.sqhk.co/guxifunuris/die2gaw/cricket_bowling_machine_for_sale_in_sri_lanka.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/Ohejijj/77084952488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_60527b9861e45.pdfIn PDF document text
    • http://rabiwitijif.medianewsonline.com/aiag_spc_manual.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/87268203252.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481423/normal_5febd02f13ade.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/fhggjhK/univision_noticias_miami_florida.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/behringer_q802usb_noise.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/Hjhm9jj/53922618995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_601b3b6437c98.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/f7gclha/electric_radiant_floor_heating_diy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_79ae88bc074a4506a5d4ed7ff7dd4642.pdf?index=trueIn PDF document text
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_39fa044ef7f64be29825909a674eb5dc.pdf?index=trueIn PDF document text
    • http://rosajeku.myartsonline.com/automobile_engineering_diploma.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_8b11f2adf99e4584b66d175103d4d98e.pdf?index=trueIn PDF document text
    • http://xizokenimufewom.atwebpages.com/24658397257.pdfIn PDF document text
    • http://lawiferow.myartsonline.com/pidomuzijeduzalezamekeva.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_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 5048 bytes
SHA-256: c121b5b170f49714e8c38905a77b6ca02d32e186d26d6be11c9f4e31554c46d5
font_01_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 11184 bytes
SHA-256: cc998de88664cd177e531114fdab24580d21ca4fba620594a02da7708146d943

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