Malicious PDF — malware analysis report

Static analysis result for SHA-256 df97cfcc6ecdbb71…

MALICIOUS

PDF

86.9 KB Created: 2021-05-01 20:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1448aa3541a8e3dcb434c70055ff5ab4 SHA-1: 26dc87794b7514f7f5c979f23aa6c31212e14ab1 SHA-256: df97cfcc6ecdbb71d28588a9c4f2ff55dae5fc273305a807b594d122ba35ab38
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 0.9995

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://dugedepap.ru/strik?utm_term=icom+706mk2g+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449422/normal_5ff187f0040c9.pdfIn PDF document text
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/zawizej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5fd8e9ab4d79a.pdfIn PDF document text
    • https://refefutetolesom.weebly.com/uploads/1/3/4/8/134868450/6782678.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401712/normal_5fef7d32bb1b5.pdfIn PDF document text
    • https://rupusuji.weebly.com/uploads/1/3/4/8/134878943/779021.pdfIn PDF document text
    • https://kodowukufu.weebly.com/uploads/1/3/1/4/131453871/6113440.pdfIn PDF document text
    • https://gupoxebexu.weebly.com/uploads/1/3/4/3/134337811/tudemowutenevolot.pdfIn PDF document text
    • https://xuvajova.weebly.com/uploads/1/3/1/3/131380845/tevop.pdfIn PDF document text
    • https://xovonanukotu.weebly.com/uploads/1/3/4/8/134898985/bedipiwijakug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_681d3efca34b4a8d9f2a0a3cf15faba7.pdf?index=trueIn PDF document text
    • http://paxafumalinuber.epizy.com/datsun_redi_go_crash_test_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372942b0-316d-4722-a140-5fb33b1a1c77/mamiya_c330_for_sale_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6058fc-af3c-485b-8720-572eded14b4c/musemanezasumivisobuzom.pdfIn PDF document text
    • http://pebitezilewabe.rf.gd/basic_topology.pdfIn PDF document text
    • http://desojamoj.rf.gd/my_aged_care_assessment_guidelines.pdfIn PDF document text
    • http://sujawusoxenum.rf.gd/93234794767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad99cb7-b0f6-45d5-906c-68346fc12369/schwinn_sidewinder_mountain_bike_26-inch_wheels_weight.pdfIn PDF document text
    • https://4fcc26ae-a476-48f2-98aa-cdc5c12f4544.filesusr.com/ugd/32d0e1_bbd95325837d4af9aac07ea4f59305c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd4dd70-ea5b-4e49-bffc-ffb8cefabcf0/how_to_paint_stairs_wall.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_a3ce50615aca4ad4a94463d2dc9adfcd.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_ef35d9d7aee447bc867df596431f1352.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 5356 bytes
SHA-256: 74332a150102d5df4245c326c4f9d3b78ac80c97ed15653dfedbec14b4a5bfa4
font_01_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 13724 bytes
SHA-256: 4f71f109d9746191b156b7e8e576dcce524caecbf620bb8410507a97f9edeb16
font_02_sfnt_off000134fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FC 16920 bytes
SHA-256: ae3c9a675ebd4130a0b031308be8e5b9c0616e6343eb4d2c6ec28826bd3dac6e