Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae031afd2151bbee…

MALICIOUS

PDF

73.5 KB Created: 2021-03-25 14:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 757429ae3fd9e159d49a9301655d1692 SHA-1: 83ae24bcd37f1c24d2b95afaa227513804a75098 SHA-256: ae031afd2151bbee0bb816d5edcdcef9c95411f600ac5c39385617fbfa28a6ba
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to contain keywords related to web development, potentially as a lure. The presence of numerous external URIs and the ML classifier output strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/123?utm_term=formdata.+append+not+working+in+angular+6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384296/normal_6036cffa18fde.pdfIn PDF document text
    • http://lightstart.xyz/tufokagelolufuvitazapixxi50m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_6014e6120820c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404753/normal_601765b127120.pdfIn PDF document text
    • http://rat-red.space/reading_comprehension_books_for_5th_gradee76ne.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425921/normal_5ffae880d5f39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450502/normal_5fd9b9eb5ee54.pdfIn PDF document text
    • http://alifan.store/librecad_paste_multiple_commandsedbkt.pdfIn PDF document text
    • http://itawegan.space/mass_effect_gibbed_save_editor_guideq6t0x.pdfIn PDF document text
    • https://geliwesirodired.weebly.com/uploads/1/3/1/3/131382982/66dd26b.pdfIn PDF document text
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/lekabo_wopiperekexadij.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/cjiK9gj/tower_conquest_mod_apk_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/jjgehbm/92689755258.pdfIn PDF document text
    • https://nuwuzeparagagux.weebly.com/uploads/1/3/4/8/134883197/2744247.pdfIn PDF document text
    • http://wegansit.space/asus_rt-n66r_setup_instructionszsx0v.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/0f0bd9e57d09ad5.pdfIn PDF document text
    • http://********:8080/****/**/report/addReport/���+id,fileToUpload,{headers:undefinedIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c8d80e7-2998-4b53-b1db-ea2053e4eee2.filesusr.com/ugd/5c8c55_1b5c58c84a1a4540a33dd0770e4fe88d.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_9c36d22d309743ec8e3abfda7c9c1e61.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_eb2ad81c66374323bebdfda6760a2a6e.pdf?index=trueIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_f8f5ae6af86f4282a5d31abdc68f5ed1.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_e83334f6b89a42a28b87d38d7f417899.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_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 5396 bytes
SHA-256: 385944b18a1834b76f02c5ea373f78a5eeede593ddefc11da7b28039cecd5a90
font_01_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 11676 bytes
SHA-256: 6e8e9369a099a91ecf8478153f060fbac45e8a66afa7ac8dca5dfdf6ddda5f57