Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4ca040cf10653d…

MALICIOUS

PDF

83.9 KB Created: 2021-04-19 05:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 99e369f1dfe793b0ecac00bca3a5bf49 SHA-1: 5b3d0ba59c087643582dab57b86ecb1ebf197e65 SHA-256: 4e4ca040cf10653de583c08229a9e55b91bb6c41cd4cded17220c470018de97e
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 0.9998

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=mutual+termination+of+lease+agreement+form+california PDF link annotation
    • https://duvozogol.weebly.com/uploads/1/3/5/3/135314926/f4ebbc6f.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/221637652.pdfIn PDF document text
    • https://jesipawuba.weebly.com/uploads/1/3/0/8/130874316/9451865.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_d1bd5490e8164f0d8daca8a15eb23b7d.pdf?index=trueIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_090af26aabcc44d6946d7301a80a8205.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabom/regogulopotutoz.pdfIn PDF document text
    • http://widopux.epizy.com/apache_commons_csv_1._2_jar.pdfIn PDF document text
    • http://gesulobanaxa.rf.gd/84353655136.pdfIn PDF document text
    • https://c93ae04b-3d95-4128-ac62-0503c91a26e1.filesusr.com/ugd/002f5e_64c4eaf31f574e9cb14e55a3a21fdb64.pdf?index=trueIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/inorganic_chemistry_pw_atkins_download.pdfIn PDF document text
    • https://190d602c-e74a-4ea1-b1d2-d722d7947d0f.filesusr.com/ugd/1eddd4_3a58a47ee4e946999fdfe5b3111bb36c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/dumepefaximenip.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_07cabe64f0124617886c7050fb8d682f.pdf?index=trueIn PDF document text
    • http://sadoboxijowem.myartsonline.com/1499457697.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_9f55f02435fe4e8cb61b2aaefd7d6443.pdf?index=trueIn PDF document text
    • http://duwenifigeni.rf.gd/haccp_manual_template_free.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_3080b7d42da7443091469ca7ee06687f.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_1238b01770984fed8e836a48ade12238.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_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 5208 bytes
SHA-256: 4674b8590d2e7c59abbb45948302659c85565a781218d853b79889899a24916d
font_01_sfnt_off00011ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB1 11636 bytes
SHA-256: bddea0c14d1c2f41b6d92f47b690529a1d5408988961f8525843457aa8cdd1bf

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