Malicious PDF — malware analysis report

Static analysis result for SHA-256 0043ecaf8c2a3cc4…

MALICIOUS

PDF

96.1 KB Created: 2021-03-15 22:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: de2bb466caf70b23f08ac84d76c22f7f SHA-1: 28923ecf6f388622347265946576c818d6f9c996 SHA-256: 0043ecaf8c2a3cc47ed7c66ca8fecd34eb3407d84c60fe5d5527e9be6a29d926
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://vilenefex.ru/wix?keyword=amana+bottom+freezer+refrigerator+service+manual PDF link annotation
    • https://cdn.sqhk.co/rudugebakivo/gejeaii/61745962535.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/fryN6jc/biwixejekugisatasesoja.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/c10a9494-d25b-4c0c-a890-ffd846096c80/how_to_write_a_self_assessment_for_an_administrative_assistant.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_12ad2db9760941089f48794198e8fd1a.pdf?index=trueIn PDF document text
    • http://pasazaxara.rf.gd/zosanemofipobodota.pdfIn PDF document text
    • http://timekexewug.epizy.com/kigumutavawu.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_e55a960de8d049fd944d546fbb02c40f.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_ce439394db3543f2b2edd247049fb698.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_e9d7364547bf41929474da90540cd5f3.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_60a7f8228d544417aeb981d022b4b258.pdf?index=trueIn PDF document text
    • http://pofumitiko.epizy.com/dsc_user_means.pdfIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_9c1e8a3b5aca4822af9e8065f17c263f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5688092c-fc1a-4890-854f-e6262ca57632/rutugariwozekezaw.pdfIn PDF document text
    • http://xizajitidug.rf.gd/d_d_3._5_character_sheets_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8556104-dc5e-4d5f-bb51-dc251a957d7a/is_there_a_camera_inside_the_model_3.pdfIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_b22a422278b740b6a395ceb5b0ce52e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01f6d05-a06d-48f7-874b-2ea0150182a9/sosojaka.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_off000133cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CF 5440 bytes
SHA-256: 60ab3de398cb15898454c4b61a750b83d0b6698998fc78afc708ad952681d237
font_01_sfnt_off0001464d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464D 14960 bytes
SHA-256: 477ea74b0633ee51bcafaaa2e479b8f5ec7b84bfe2fa5c5cc8da2063f00765d6

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