Malicious PDF — malware analysis report

Static analysis result for SHA-256 916fa07d49ec570f…

MALICIOUS

PDF

76.4 KB Created: 2021-04-08 07:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bd1c0f093071816c466f21f57953808a SHA-1: 754c9c322f8a3bdaf0ffc38ee84510ed397e2e91 SHA-256: 916fa07d49ec570f9cf84bae4d82137bb6befc2a3ce5dd9c27d475ea5ad3ad9b
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 0.9948

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://jumiwimov.ru/123?utm_term=westlife+flying+without+wings+piano+sheet+music PDF link annotation
    • http://vukosam.22web.org/biwuloxivugepeda.pdfIn PDF document text
    • https://sedidumorasu.weebly.com/uploads/1/3/4/5/134507492/2337001.pdfIn PDF document text
    • https://karesaxu.weebly.com/uploads/1/3/5/3/135392924/1485138.pdfIn PDF document text
    • https://ladeletoleworuw.weebly.com/uploads/1/3/4/7/134712388/8198469.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/wolalexujavogiw.pdfIn PDF document text
    • https://nakusiwikabudu.weebly.com/uploads/1/3/4/9/134904560/vagof-kukelemelifaji.pdfIn PDF document text
    • https://rejejowurodesom.weebly.com/uploads/1/3/1/3/131398559/basapetubetoworev.pdfIn PDF document text
    • https://desofaris.weebly.com/uploads/1/3/4/6/134612921/mewig.pdfIn PDF document text
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/pusubojalarubanog.pdfIn PDF document text
    • https://pofekivivefuron.weebly.com/uploads/1/3/5/3/135339802/kokix.pdfIn PDF document text
    • https://duxujemiw.weebly.com/uploads/1/3/4/7/134743688/suvinude-basatuj-terebasafoje-gadal.pdfIn PDF document text
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/90147.pdfIn PDF document text
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/7387889.pdfIn PDF document text
    • https://vetebifarex.weebly.com/uploads/1/3/4/0/134016991/5324410.pdfIn PDF document text
    • https://juladugalevatib.weebly.com/uploads/1/3/4/3/134385664/2ac60.pdfIn PDF document text
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/6264309.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufexozotatodel.epizy.com/34822330893.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_99ef35af19cb4c859cc77f0284215f17.pdf?index=trueIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_30f0b149c9f84b9d81cf657b381fcfd3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c597a04a-3301-4cf7-a823-2cb00b6278a7/rupix.pdfIn PDF document text
    • https://82c1a4a6-0aea-44ab-842b-07cb5bdde860.filesusr.com/ugd/aafee9_72ab567675b14418a639e0fe0a6d855e.pdf?index=trueIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_3aed495f07d34dd188b905772d5f8d6c.pdf?index=trueIn PDF document text
    • http://boludit.rf.gd/487048447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0fcc662-ffb1-4d96-b414-7fb86d583ac3/28790307701.pdfIn PDF document text
    • http://wuzuferopo.epizy.com/kivajisonujugu.pdfIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_677e7fd2f0044d5f979721f8f31074d2.pdf?index=trueIn PDF document text
    • http://runisinifozi.rf.gd/bakukabom.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_off0000d6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 5540 bytes
SHA-256: 133e19fe600214b4bf626a0376016412b884df00e4c0a007b919507b161ac30e
font_01_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 10552 bytes
SHA-256: aeb8ba573df44d58f049420bc53beb970001db320a090e6ad077e555c0d0145d
font_02_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 16120 bytes
SHA-256: 184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832