Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6842b9306e54b00…

MALICIOUS

PDF

77.2 KB Created: 2021-03-29 13:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 67045f420dc09c15ce22ee2916da4713 SHA-1: 44f2f9bb578e792c73e06bc472d94b9f6704ed6a SHA-256: d6842b9306e54b00eda60c58f9aec3733d264832e854f3eba010805b3b4b6e28
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 0.9991

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://fokemale.ru/award?keyword=cells+and+tissues+of+immune+system+pdf PDF link annotation
    • http://cethq.xyz/2153103677eyz6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_6016eb93be08e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_603bf68f52f35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_60207acc48192.pdfIn PDF document text
    • http://uablog.website/rikugudigadupozazalarekambs70.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/lejinexikatatowisojik.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/ribejezixuvatamaludovori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479212/normal_603c42e641fec.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/shimano_di2_external_battery_mount.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_6010fff74f40a.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/surah_yasin_file.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448719/normal_605ac5a951502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_6009b066d19ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_600a5af35f866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_6038c3045ebb7.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/learn_python_-_full_fundamental_course_for_beginners_-_python_tutorial_for_beginners_2019.pdfIn PDF document text
    • http://goldstein.berlin/19722197213dmdbl.pdfIn PDF document text
    • http://begemot.space/79312578764zc75v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_a3dc6884a73c46e3998ceceb53c8b63f.pdf?index=trueIn PDF document text
    • https://e19809cf-df80-48c1-9975-8599b001ad7a.filesusr.com/ugd/062cdf_75b9343ffa014549ac5e43491eec9f35.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_8940f2fba80a4b5dbf319937a60fa209.pdf?index=trueIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_cddc8d84b6e543f6bef35e7d2592267e.pdf?index=trueIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_5b28d984c81844b89a68a0dc8cc22edf.pdf?index=trueIn PDF document text
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_759369c99ec9493ca02209bcb396943d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 5096 bytes
SHA-256: eb9a0bb94e4443bb1eb41ecbd7859e9cb6ba7d35323d0996cb6409c4b3c40bb1
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 10384 bytes
SHA-256: 2c256f3e494e0e0d913e0f24d1dc9fa711603e1686d2ccd381310131b25b33b0