Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c4ceda244ed10b…

MALICIOUS

PDF

82.0 KB Created: 2021-03-24 21:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 689178f0bbe5c205b74168fbec0b4a49 SHA-1: d4ec62dbad26e6feb9dc30659ff6d94ecf2f33a2 SHA-256: 31c4ceda244ed10baf3e4f19af0d681bb2d8c2db279de85ba39f5057475e1798
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 0.9993

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://druttle.ru/123?utm_term=creature+3d+movie+song++wapking PDF link annotation
    • http://tegor.xyz/20928026038gmzme.pdfIn PDF document text
    • http://ru-dev.xyz/can_i_renew_my_michigan_drivers_license_at_a_kioskuuwbt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500889/normal_6043884899a90.pdfIn PDF document text
    • http://termo-nord.tech/kubuxoziditevuxede5j2t0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495039/normal_5ff75c62ac479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503524/normal_6004e09dec74f.pdfIn PDF document text
    • http://mydenverneighborhoods.com/coldest_city_in_us_lower_48hj4r1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445880/normal_5fc57497e66a8.pdfIn PDF document text
    • http://specrazreshenie.com/81098951079smo26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501208/normal_5fef508de85d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_85738406f8a54630a164a2668811d08f.pdf?index=trueIn PDF document text
    • http://fakefujakarip.rf.gd/estratificacion_de_riesgo_cardiovascular.pdfIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_21ea90ab36d54ff8bffad637f4b20d2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/092c3ba4-cff4-45be-9246-79e27b4780b9/22494321213.pdfIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_8007974e6a0d42159c895b307349895f.pdf?index=trueIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_9dee4a19395b4462b98bae2354d561af.pdf?index=trueIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_3097898a8b0549c49ca79c64898c640c.pdf?index=trueIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_02f3dc62c48449e093e1708f91564393.pdf?index=trueIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_0f48b5ea668844d49b13e24c2a4dbb0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef30364-7b1c-47aa-91f9-d71d27d846f5/navuvirutad.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_51ff9488b0dd4ec98fed61c726bdfd22.pdf?index=trueIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_4eac21572bee418daa000ef2179736e0.pdf?index=trueIn PDF document text
    • http://sotemapepuko.epizy.com/11556417983.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_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 5532 bytes
SHA-256: 77c48cf57930a22e94cf0ccf4f1b0830d715ce616a39e250bf6c75e9e1ef7aaa
font_01_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 11772 bytes
SHA-256: 8d76346f44589271bc9af823b99375c1bd93ff3632c69598f98f51481cba5199