Malicious PDF — malware analysis report

Static analysis result for SHA-256 99196d499ffd793d…

MALICIOUS

PDF

74.0 KB Created: 2021-02-17 05:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ca99e48eb53c91c4067d1b0badfecbcd SHA-1: 4d488b09dea2c8e57b533a02025cfe70ddcc62af SHA-256: 99196d499ffd793d43d784bf87e339e33a4d5c13957f2d09a60a1404232cda62
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to various websites, including one that mimics a search result for 'clarinet etude books pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using multiple disposable hosting services to distribute links, suggesting a phishing or scam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://jottigo.ru/wix?keyword=clarinet+etude+books+pdf PDF link annotation
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/e2b23.pdfIn PDF document text
    • http://update-win20.online/barsena_bestandhi_menikahi_putrimuddmgs.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/muribokikesopamasure.pdfIn PDF document text
    • http://miruzoguke.iblogger.org/91113875166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_5fdadfb74dcd8.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/jibebu_moxexukovifulob_zuviwozufikopo_wanokemoja.pdfIn PDF document text
    • https://mafivuvaga.weebly.com/uploads/1/3/5/3/135323118/ae4bce8a45684.pdfIn PDF document text
    • http://huaweistoreukr.xyz/laruzoa7pal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_601470a719e9b.pdfIn PDF document text
    • http://wuxifev.iblogger.org/academic_journal_template_google_docs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486963/normal_600497b419e9f.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
    • https://s3.amazonaws.com/jazamerijekufol/xurimimozaseruwaxob.pdfIn PDF document text
    • http://vubenotabajumem.epizy.com/toshiba_lcd_colour_tv_stand.pdfIn PDF document text
    • http://nifopufu.epizy.com/xasafus.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_off0000d8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 5144 bytes
SHA-256: 1e4cebed87eb51d83f381036e837ee188b83879d60ac61475245c79cffbeaaa4
font_01_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 10068 bytes
SHA-256: 1e7bd4236b7c64f9c47e4129c5d56120a78275517726d6e76e9a4cd4d74e6d00
font_02_sfnt_off00010cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.