Malicious PDF — malware analysis report

Static analysis result for SHA-256 c404df54fe2246d8…

MALICIOUS

PDF

81.5 KB Created: 2021-02-11 12:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2788ab2bfebb00cad07a1e99439a323c SHA-1: 3bae08f6d417c2e9dd14d45df2d5097e52730a85 SHA-256: c404df54fe2246d8287b220c076c41fc55b01286d677bb7fd0bb70e67f75fce9
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://maypoin.ru/123?utm_term=kodi+18.3+apk+firestick PDF link annotation
    • https://vebazefi.weebly.com/uploads/1/3/4/0/134040586/nowef.pdfIn PDF document text
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/kenosivivufis.pdfIn PDF document text
    • https://tomavibevojivow.weebly.com/uploads/1/3/4/0/134016690/dizuz.pdfIn PDF document text
    • https://cdn.sqhk.co/xanikadir/jdhgI1o/dash_fruit_and_veg_delivery_brisbane.pdfIn PDF document text
    • https://jositaloj.weebly.com/uploads/1/3/4/0/134042718/beten.pdfIn PDF document text
    • https://kanumipiga.weebly.com/uploads/1/3/5/3/135346224/18e988b.pdfIn PDF document text
    • https://tiledumojamusej.weebly.com/uploads/1/3/4/0/134096308/vipax.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/fcijfhe/zimaxiwofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530151/normal_5fd9e56901ccb.pdfIn PDF document text
    • https://paxogusav.weebly.com/uploads/1/3/4/0/134040839/4508278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5ffade1e5299c.pdfIn PDF document text
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/lerip.pdfIn PDF document text
    • https://vurabagugodemox.weebly.com/uploads/1/3/1/1/131164039/larigaximusizaj_wulokanej.pdfIn PDF document text
    • https://xefimobabizigur.weebly.com/uploads/1/3/1/6/131637686/8468588.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/cgcvjjE/minigames_plugin_1._14.pdfIn PDF document text
    • https://kabijibijeg.weebly.com/uploads/1/3/4/9/134900291/2368253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444123/normal_5fce601c2d754.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/mobaru.pdfIn PDF document text
    • https://loxerujose.weebly.com/uploads/1/3/0/7/130775489/1f230bbf78f9.pdfIn PDF document text
    • https://lipemegovaw.weebly.com/uploads/1/3/4/7/134766771/xuxibuzusow.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/whcgdih/space_required_for_air_hockey_tables.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 5592 bytes
SHA-256: 2639a63003ead27b38f431f6e2a24567a10dc24238ca9a290747a757f84031b5
font_01_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 10976 bytes
SHA-256: 17b297fc20163f3fdebd687ec178de800a537925d44c6d4a9904dbc409d62011

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