Malicious PDF — malware analysis report

Static analysis result for SHA-256 df77c3b2d0cc2cbf…

MALICIOUS

PDF

82.2 KB Created: 2021-03-22 14:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5557aa3268aa44027932eea065fd4797 SHA-1: 7c9da1085e1373732192bd8dfe286a44f4de064f SHA-256: df77c3b2d0cc2cbf0c09e7e889a816d7a04e42f4e2f59ca81906de3b729ebbff
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs, many of which point to disposable hosting services. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/aws?utm_term=aspectos+politicos+de+mexico+independiente PDF link annotation
    • https://regifedemez.weebly.com/uploads/1/3/1/4/131406591/827e60e3c6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_600ce320b37ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_5fe802817bdbc.pdfIn PDF document text
    • https://reperitibomotij.weebly.com/uploads/1/3/1/3/131383541/8313503.pdfIn PDF document text
    • https://tapotupuj.weebly.com/uploads/1/3/4/8/134866757/palumakojotete.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/julus.pdfIn PDF document text
    • https://popogupu.weebly.com/uploads/1/3/1/3/131398113/mamidofo.pdfIn PDF document text
    • https://domafotenok.weebly.com/uploads/1/3/5/9/135973376/rifibubobunivevadoku.pdfIn PDF document text
    • https://limudetoruvuvo.weebly.com/uploads/1/3/4/8/134890021/relekozexamujat.pdfIn PDF document text
    • https://pofitefe.weebly.com/uploads/1/3/4/6/134617546/071a82.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/vunomebudodepabozisazogu.pdfIn PDF document text
    • https://buzowupe.weebly.com/uploads/1/3/1/4/131483044/9081917.pdfIn PDF document text
    • https://dibozuvoba.weebly.com/uploads/1/3/4/6/134692955/gamasubakolodari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fcfed1aa79dd.pdfIn PDF document text
    • http://bobujopolodusol.mygamesonline.org/tejedogufababata.pdfIn PDF document text
    • https://fegafedanopi.weebly.com/uploads/1/3/4/3/134311678/6812093.pdfIn PDF document text
    • http://suvoramitasowiv.22web.org/html_to_c_free_nuget.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_fb342dc7766c4352988c65ba252af6cc.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_f5c4f709c246473392609d2ee67abca9.pdf?index=trueIn PDF document text
    • http://rodever.rf.gd/37011633997.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_bc33b03dfa694d33ad0291cd28196292.pdf?index=trueIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_dca2b5518dbd4413b6225e1fd9ac5d29.pdf?index=trueIn PDF document text
    • http://rexevigiseb.epizy.com/tuvotuwowumokotefafutogo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 4968 bytes
SHA-256: 36b385468720433322a732aa86a2072cb46d77da9536a71cad3a2a24a9318d04
font_01_sfnt_off00011525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 11768 bytes
SHA-256: 15e42363e20750516488cf522af2d3d6fec858ea2a435ece9d608813d5b358e8