Malicious PDF — malware analysis report

Static analysis result for SHA-256 be40fcb7bac6038c…

MALICIOUS

PDF

76.1 KB Created: 2021-03-28 17:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e06a1b582166c7744ce8bfa4f147e1ba SHA-1: 6314fecdaae233b256ba0de79180cecf870ccfb3 SHA-256: be40fcb7bac6038c24c954c1d3c592c92f9510cecfaf42ff0a0a40f993533d1c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external links to other PDFs hosted on various domains, with a significant number of these links pointing to disposable hosting. The primary purpose appears to be SEO manipulation or the distribution of further malicious content through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=are+green+smoothies+good+for+pregnancy PDF link annotation
    • http://bidizujimon.getenjoyment.net/the_data_science_handbook_github.pdfIn PDF document text
    • http://vorecan.fun/stock_market_closing_time_day_after_thanksgivingequfz.pdfIn PDF document text
    • https://noxaxubobef.weebly.com/uploads/1/3/1/3/131380993/zevuzupuw-pagosukato-zomeliridow-wiviriw.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/3837413.pdfIn PDF document text
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/f56b46.pdfIn PDF document text
    • https://sulipebi.weebly.com/uploads/1/3/0/7/130739254/wowonuritule_xivulosime_vonanador.pdfIn PDF document text
    • http://wozuxel.getenjoyment.net/wakavururuzegi.pdfIn PDF document text
    • https://dudulisatosix.weebly.com/uploads/1/3/1/6/131637211/6646766.pdfIn PDF document text
    • https://gedibaforajipet.weebly.com/uploads/1/3/0/8/130874683/1984011.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/75620869314.pdfIn PDF document text
    • http://the-glow.ru/south_carolina_highway_mapbr4by.pdfIn PDF document text
    • https://gabejudunutulan.weebly.com/uploads/1/3/4/8/134887900/c4b1a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://93641f3c-03d3-4c8c-b6db-0fd9bfabe798.filesusr.com/ugd/384ca7_509c3ca58aad41b0806aecd5f4295768.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_f491dd0ff7304e14bdc3a0371f286c16.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_f748cadfe4e042a584791d470a12e72f.pdf?index=trueIn PDF document text
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_734ef8466abc41b689777fb0339e3cab.pdf?index=trueIn PDF document text
    • http://vapewokadovusa.myartsonline.com/margaret_atwood_the_testaments.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_5d8e6ea052614e30b7f82d5d351863d2.pdf?index=trueIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/62066990626.pdfIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_cef4b39472534b0fb76bb5ccb07c0894.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_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 5628 bytes
SHA-256: 07d285a0c9aaeb467df9039f85f0ce48de65d314da31330bc567f1e63daf2d0f
font_01_sfnt_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 10908 bytes
SHA-256: ad12b543d124262105cc33c6c6d8aa06d965195ed5f4887c06cd18897138c787