Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab04df0382637996…

MALICIOUS

PDF

94.4 KB Created: 2021-03-31 21:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e1b8cc566d6679bb13a23dde8560d2d0 SHA-1: 57fdbe5aab7ff091b60b7ad651adfdd831717038 SHA-256: ab04df03826379968ce6ca25a55eae21d64d7d0dc7bfb215f377bf592ec765c2
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 0.9996

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://gimoguvi.ru/award?keyword=mekanisme+kerja+antijamur+pdf PDF link annotation
    • http://kejoxemubogese.mywebcommunity.org/37036787165.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/domimurukisur.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/56492225263.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/zibola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_bd034d0eeec04457a7bfdff07a073255.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4341fb1-30ae-4cf2-acf2-ad4422a73cfe/do_i_need_an_8_quart_instant_pot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9c061e-db26-4daf-b9d5-3561f829ffa2/zoget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d94dc1e-3394-4607-a01b-582cc2f4ece7/sat_writing_practice_prompts.pdfIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_233f96b6428d4df29e1f1fab4719c5cd.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_795e2a175f3d4b87bccf5406ccd43f30.pdf?index=trueIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_2411175c38af4f00b9e55e7e907d2165.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a999251-ae31-4db8-9f2d-32908e8566a4/58027494745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6095455c-11ff-4e90-aa18-c9e36d03ab5c/smoothie_recipe_book_barnes_and_noble.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_6471597f6395470b9a0b6357e7589a57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3b5efe-031e-41b8-aadf-fdaecdf8b392/72655222683.pdfIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_6e1ee1bb23cd4da89c9431c1b3cbc6db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d48f558-0a9c-4018-adaa-6a8ced5f5dc9/24576572410.pdfIn PDF document text
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_2dfb314f61c3458f9dc3fa19008be5fb.pdf?index=trueIn PDF document text
    • http://wokakasav.onlinewebshop.net/27778138026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8b5424-5193-437c-8dcd-888862abddea/55713463109.pdfIn PDF document text
    • http://ludugatitabi.atwebpages.com/1001_arabian_nights.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
    • 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_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 5300 bytes
SHA-256: fcc7c674372f4cc4ea1a1154f3e7d16db1e387841bca5ac9646bb8cb0e158d5e
font_01_sfnt_off00012ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 12364 bytes
SHA-256: bb8309795ac4841b16fc0f79c9c4767111617d0cc3f08c7dd6bd3fef54eaca91
font_02_sfnt_off00015766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15766 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330