Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5590186cb57cc7…

MALICIOUS

PDF

90.6 KB Created: 2021-03-21 06:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 448b8526b682f2209b65e21746f9456a SHA-1: fa9337e83376652f4dc25abfa53e0ad386064924 SHA-256: eb5590186cb57cc7ae0a4244d7343ab38a67d427cdc652f192bd811ac55f4fe3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various domains, some of which are associated with SEO manipulation or potentially malicious content. The presence of a 'download button' lure further suggests an attempt to trick users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/award?keyword=marvel+encyclopedia+2020+pdf+download PDF link annotation
    • http://dimoguzix.iblogger.org/how_to_put_sd_card_in_roku_3.pdfIn PDF document text
    • https://bagopilijesab.weebly.com/uploads/1/3/1/4/131438775/nadusa.pdfIn PDF document text
    • https://kibopomirisusi.weebly.com/uploads/1/3/2/7/132741064/sifox.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/aegejcm/woodshop_clarkston_catering.pdfIn PDF document text
    • https://cdn.sqhk.co/ropikenetu/FhhidF4/2488494745.pdfIn PDF document text
    • https://cdn.sqhk.co/sidigodoga/K9Djj4V/n._o._v._a_legacy_gameplay_espanol.pdfIn PDF document text
    • https://bejolikide.weebly.com/uploads/1/3/1/4/131437094/02c823f21.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/EigeK3v/75602464372.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/a1714ff9-b743-44da-9c56-55a4c484c366/what_pellon_interfacing_for_face_masks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595e88c7-8428-4015-9ef3-a20a4d3739f1/56533266374.pdfIn PDF document text
    • http://nafakosoleg.epizy.com/catholic_cardinal_virtues_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99bb6dc1-48a6-4d86-ac7f-eac9ddb70873/xubizowuxojawuxaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c485c72d-a054-49f9-aeca-15ebc6d86837/ralph_waldo_emerson_historical_significance.pdfIn PDF document text
    • http://vabanenutulaki.rf.gd/89990437194.pdfIn PDF document text
    • http://sawozepanoludib.rf.gd/southern_railway_station_codes.pdfIn PDF document text
    • http://kujafugakare.epizy.com/fefekorel.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_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 5504 bytes
SHA-256: c959376defc3baefa7f6fbe46eb05d3546bcfc1ce1c012b0f5c13a0d7c9f728e
font_01_sfnt_off00013576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13576 11840 bytes
SHA-256: d90b5fd4cca69fa6edef8a4bc42a5cf6856c1c6ef513ffe596ad51e785487410

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