Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b9c6e5f1589d7c…

MALICIOUS

PDF

80.6 KB Created: 2021-03-06 11:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 40a4a4d88013992e3e1b60ee047277b3 SHA-1: 0aad66a2ef577dda6dea821e368ae82389e44c93 SHA-256: b3b9c6e5f1589d7c34cfc00604ad571c0215bce85f9fe77f68d7672ca5e68d66
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The embedded content appears to be a deceptive lure related to a common search query, designed to trick users into clicking on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=how+many+cans+of+formula+does+wic+provide+in+nc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489977/normal_5fdba18b53748.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418991/normal_6002b31bc6a11.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/what_time_does_plant_city_high_school_start.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_600b0172b44d2.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/how_do_i_get_serato_dj_pro_for_free.pdfIn PDF document text
    • https://gitiritibew.weebly.com/uploads/1/3/1/4/131483488/sufinob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5fe348d63db5c.pdfIn PDF document text
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/nurazadag_dumixu.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/murafimobaraniz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5fe8072897202.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_5df538f8e7d848fda01f784621cac249.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_6334f6e006654a05a08d3a69aac30638.pdf?index=trueIn PDF document text
    • https://835e8637-c19e-4787-b354-697c3ebd04b7.filesusr.com/ugd/c068f8_86b9daa984bf4495bd91ebb9c2873035.pdf?index=trueIn PDF document text
    • http://wugujub.onlinewebshop.net/rasimubuvurut.pdfIn PDF document text
    • http://zuwemanikipe.rf.gd/19847344387.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_3c09526e07884f28bc726715cc0eed03.pdf?index=trueIn PDF document text
    • http://wilopomuba.epizy.com/kagabovevejuretowova.pdfIn PDF document text
    • http://vufebadavoga.epizy.com/46439419308.pdfIn PDF document text
    • http://piduvazudofem.epizy.com/pinozorebig.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/baforeziradodafi.pdfIn PDF document text
    • http://merapenerabari.myartsonline.com/how_oxygen_concentrator_works_video.pdfIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_1c30e1a600114452a4ff00773366136d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/free_printable_cartoon_strip_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 3384 bytes
SHA-256: e7beeb68b878ae2b5cef2abd95f95dbcdaf65f8a4dc4b9df1280befca2b168ef
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 5516 bytes
SHA-256: 1b361d23950caf160106573902fa273384bbc8ec35838c5ad03fa14a2a0b4a53
font_02_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 11624 bytes
SHA-256: e3ae4e3a15020970f5b845ca1cd2b863d742453c2a875b63320f75baf798e0c3