Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1ee49d89d52358…

MALICIOUS

PDF

72.2 KB Created: 2021-02-28 16:21:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9adb60515de30e9bfd3b2f5b8001795b SHA-1: 28664e77d3e590485e8db8c01acee77d5327788b SHA-256: 7f1ee49d89d52358c7bfee5ac15cb2af2fa473c509dca6c1374bbf97eb06af23
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=how+to+restart+an+ipod+nano PDF link annotation
    • https://sokotomajav.weebly.com/uploads/1/3/4/0/134040389/xiselezujunujunaliv.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/nonton_film_the_postman_always_ring_twice_sub_indo.pdfIn PDF document text
    • https://cdn.sqhk.co/wupetutigo/tjdjajg/34244901383.pdfIn PDF document text
    • http://just-gopro.com/download_film_irani_metri_shisho_nimc89lm.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/gZhcBid/castle_stick_figure_series.pdfIn PDF document text
    • http://gusudula.iblogger.org/tajobumelizo.pdfIn PDF document text
    • http://soul-felt.com/xylo_bgc_eventstoq25.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/ieieHXt/16561039953.pdfIn PDF document text
    • http://fuzebopirafune.22web.org/slope_stained_glass_project_examples.pdfIn PDF document text
    • http://telgrm.site/cares_chorus_sheet_music_freebhpz2.pdfIn PDF document text
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/37fa42610c5baf2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/38474811880.pdfIn PDF document text
    • http://mugevewobota.rf.gd/pufeselemet.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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 4976 bytes
SHA-256: d53a020e2328741a5d15a6f30e1b7f1377b819ed5158d9d034b1cd363d70632e
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 11388 bytes
SHA-256: 1a319547583817dbd293b8e4a8c2a31cd894408e93219a41da2b84f484e41f80

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