Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f82e893de4b3a7…

MALICIOUS

PDF

84.9 KB Created: 2021-04-29 14:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c7a80667036f3d34864a0429a2cf6a97 SHA-1: 3e789d9fb91e7cffc4362b19cee79aafe1883f40 SHA-256: 37f82e893de4b3a728ec3fd407e8638688f1afd3172abc639eafbc99ea897da5
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://maypoin.ru/strik?utm_term=senior+auditor+salary+houston PDF link annotation
    • https://patokepejiven.weebly.com/uploads/1/3/4/7/134706466/4140320.pdfIn PDF document text
    • https://rukifutotusiz.weebly.com/uploads/1/3/4/6/134685592/2622896.pdfIn PDF document text
    • http://erogan-encolumbia.site/my_work_choice_reviews406bb.pdfIn PDF document text
    • http://xatitakuv.iblogger.org/78865663321.pdfIn PDF document text
    • http://vehicleusains.com/guririrojjhgzx.pdfIn PDF document text
    • http://fixadazopirutus.22web.org/72103084612.pdfIn PDF document text
    • https://voranafirodibug.weebly.com/uploads/1/3/2/6/132696030/puxekaminuve-fejodexopan-lezez-lijabizimazoxo.pdfIn PDF document text
    • http://dontbeshy.xyz/vekixemg1q20.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/sojajebeguxotav_kilokix.pdfIn PDF document text
    • http://upgrade4me.com/vowizonewebunscvuu.pdfIn PDF document text
    • https://rowagikej.weebly.com/uploads/1/3/4/6/134678960/3015099.pdfIn PDF document text
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/lorekogib.pdfIn PDF document text
    • https://metumarexidema.weebly.com/uploads/1/3/4/5/134591821/serad.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/latoxebav.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/c2dca73b-17d6-4afe-b7ce-6cd8423d6b93/98114740117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222f8859-2920-4d55-b563-28c883a1c195/58471926851.pdfIn PDF document text
    • http://suxovonoza.rf.gd/31835555461.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_43ca044269184b56bcdaa56f876ab985.pdf?index=trueIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_f22c3f26c7814ff791d62ffca60315e5.pdf?index=trueIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_70d3f994c3304008bbf2332109f5d5fc.pdf?index=trueIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_70c37a4768a9424abb3ad339e845c868.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/425b9f84-248c-4948-897d-dce11c5dff47/jexaludino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b023ea7-9faf-4204-9225-3855e8275bb2/22136731863.pdfIn PDF document text
    • http://petodugutiz.epizy.com/76931095582.pdfIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_3284dbc921884685bd07092131b4e8fb.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_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 5116 bytes
SHA-256: eb43dbf705d9345db12002e1e7c9ccd83fd450ee783218d8a0cc71c72a54f798
font_01_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 11668 bytes
SHA-256: ddd9c9ec4d70175bba4a31ae1f459486deb8949a04b6e9c50b067dcd7b38e589
font_02_sfnt_off0001319c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319C 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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