Malicious PDF — malware analysis report

Static analysis result for SHA-256 193c4aef876c54c4…

MALICIOUS

PDF

67.7 KB Created: 2021-04-02 19:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 34bf29dbadce2c7be44c2089ead0d8a2 SHA-1: 51b8d7f2a523e68ec6834082aaebbe350407dcbf SHA-256: 193c4aef876c54c4c286e05c1688bb01e88f744bca19a39765e744f6822de695
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 0.9998

Heuristics 6

  • 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 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://midufefew.ru/award?keyword=cambridge+igcse+mathematics+core+and+extended+pdf PDF link annotation
    • https://pojebozotez.weebly.com/uploads/1/3/2/6/132695867/ramujulita.pdfIn PDF document text
    • http://kemijejanurag.iblogger.org/fufod.pdfIn PDF document text
    • http://kupawawade.22web.org/jugalinebajila.pdfIn PDF document text
    • https://ledegukumimajem.weebly.com/uploads/1/3/5/3/135393042/butonu-wokobekifo-beterorife.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/iiXcLPf/kopuwiguwilewojima.pdfIn PDF document text
    • https://ganunuzarije.weebly.com/uploads/1/3/4/5/134518475/jaxilix_xorezuxune_midixa.pdfIn PDF document text
    • https://lumigoxodavi.weebly.com/uploads/1/3/1/6/131606620/duraner_vipav_zaneped_fuxadeduguvetop.pdfIn PDF document text
    • https://cdn.sqhk.co/xesofosirija/ievP3A0/arere_ekkada_song_female_version.pdfIn PDF document text
    • https://cdn.sqhk.co/zonigita/gjqiihh/truck_mechanic_near_me_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/dif2jcp/wusijexidomobarukunumis.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/4m9igha/hair_salon_spa_salon_london.pdfIn PDF document text
    • https://nifixivenugoku.weebly.com/uploads/1/3/1/8/131856212/938c6a29d.pdfIn PDF document text
    • https://cdn.sqhk.co/poxudanefisi/ccicxgg/gafosedi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketaxesam.epizy.com/fuvunusugolujomojef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c9bd6e-8f99-43a4-aec0-16a789508eb1/77515291459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafdc1ea-128a-4137-8b55-1f1dc2d07a48/where_to_recycle_epson_ink_cartridges.pdfIn PDF document text
    • http://durumam.epizy.com/96911442891.pdfIn PDF document text
    • http://lujijetani.epizy.com/26634081979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5441e0b4-f1bf-4d47-b456-de9cea3199ab/falured.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_off0000c839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC839 5648 bytes
SHA-256: e52fd704c4e427b2c995458a3e98f39776db81191cd4379bac4ca36d8d36982d
font_01_sfnt_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 11564 bytes
SHA-256: 5b4b1971e99daac0f4235cc1552a7229186ff550226f4c17492674c2c0d8313d

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