Malicious PDF — malware analysis report

Static analysis result for SHA-256 de17c4ab727b6766…

MALICIOUS

PDF

69.9 KB Created: 2021-05-27 15:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bc574bcc11e023156b81e953eb370efc SHA-1: 10a02a2c4be6033a80feeda881cd55b30d62f965 SHA-256: de17c4ab727b67660187413c7070ac2b762aa64100ca3d678acf61e8623f4d31
186 Risk Score

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-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://leonvi.ru/strik?utm_term=squares+and+square+roots+class+8+exercise+6.1 PDF link annotation
    • https://kovapuneluwaze.weebly.com/uploads/1/3/2/3/132302913/3bb43cf6.pdfIn PDF document text
    • https://kikokemez.weebly.com/uploads/1/3/5/3/135331375/gusagi.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/8296b5ca2.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/kiwemelekinena_dekodapebe_datujase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_60252b2ace707.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/3442548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_60157a208d262.pdfIn PDF document text
    • https://vowotefanofug.weebly.com/uploads/1/3/4/0/134012563/xofom_dimewezimivoba.pdfIn PDF document text
    • https://dodaxopaz.weebly.com/uploads/1/3/4/8/134865523/97118ebba.pdfIn PDF document text
    • https://nugezufetewivu.weebly.com/uploads/1/3/4/5/134598593/refipod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_6027840abef5f.pdfIn PDF document text
    • https://jonilokakowoso.weebly.com/uploads/1/3/1/4/131453896/majefusisa.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/tusomipa-waxukodewigeg-sajefinamako.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/743ee97d-2c7d-43f0-af67-1e6b4241e42d/2008_honda_accord_coupe_v6_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2d4fc8-e2de-4d7d-a444-6b467bc4c9ad/what_is_the_interior_angle_of_a_14_sided_polygon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/596d93a8-37e1-4b32-86b0-c0b2b58e5d8e/introduction_to_computer_science_course_outline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7543e8f4-3614-4cbe-b61c-8c0c810e63dc/how_to_reset_a_tempur-pedic_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c84457-4abf-4938-93b3-322f3e0244ad/71718636766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd69a6f-0157-4593-9940-0c70bdd8995f/berserk_manga_deluxe.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_off0000d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 5664 bytes
SHA-256: b4d9cbd36e297f288224037ec7a12504bb6810884c36e3edce041eff37e3418c
font_01_sfnt_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 10472 bytes
SHA-256: d4e4040a3e7ebe9b8b7fda95dce20ea9505fe70dfe1f62ed83debe6fb54e3098