Malicious PDF — malware analysis report

Static analysis result for SHA-256 8259ee73ecaf69ec…

MALICIOUS

PDF

76.1 KB Created: 2021-02-22 20:28:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9ef76267d6fa84dcf2823cd7ab1bf331 SHA-1: 5834a306415f03b3372b5c1a6fdd572dae6bf096 SHA-256: 8259ee73ecaf69ecdd9aeb14e543f6fddfb9ce34c44a985f24facd7bdbf7b096
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including suspicious links and ML classification. The document body, though heavily corrupted, suggests a lure related to salary information. The presence of numerous external URIs, some pointing to disposable hosting, strongly suggests a phishing or malware distribution campaign.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://seumenha.ru/strik?utm_term=how+much+do+health+administrators+make+in+canada PDF link annotation
    • http://rotarovew.22web.org/93217273407.pdfIn PDF document text
    • http://avlto.best/danby_8000_btu_window_air_conditioner_reviewbaxgg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452594/normal_5fef6edcdfe50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403539/normal_5fc87644ada32.pdfIn PDF document text
    • http://managerprogram.live/tarifs_chronopost_2019l8a5x.pdfIn PDF document text
    • http://zhigina.ru/h2020_consortium_agreement_template9bca1.pdfIn PDF document text
    • http://1xbet-regi.site/ephesoft_community_edition_installation_guidevks8i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ratadipemor.epizy.com/petuvabo.pdfIn PDF document text
    • http://bofiragomux.rf.gd/tidadiri.pdfIn PDF document text
    • http://wisigisovet.rf.gd/shankara_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/lidoragetazojokuwaxelodaj.pdfIn PDF document text
    • http://bixejefasi.epizy.com/the_unbearable_lightness_of_being_movie_meaning.pdfIn PDF document text
    • http://debumiputun.rf.gd/lady_gaga_shallow_piano_sheet.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/31856897156.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 5176 bytes
SHA-256: 104f6fa732e7c61afe8ed70396130e10edef22e014375cf3b1f8c8609bb8d31f
font_01_sfnt_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 11044 bytes
SHA-256: b1be3d5044b748817fe4ac9e416598dd95d60bb2f8d6dd45a243b28b366acd0f
font_02_sfnt_off00011538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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