Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79958d20ee44ea7…

MALICIOUS

PDF

73.8 KB Created: 2021-02-23 23:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b213a8c3c328832226290845bef48a6d SHA-1: dcb64847c74a234898e5923cc0f63320188f350f SHA-256: d79958d20ee44ea75eee24d8c6f0d4f2c22345554370c6672ae5dbe7858000d8
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `https://yafferge.ru/strik?utm_term=tp+link+av500+wifi+review`. The document body, though heavily obfuscated, suggests a lure related to a 'Tp link av500 wifi review'. The presence of multiple links to disposable hosting and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=tp+link+av500+wifi+review In PDF document text
    • http://laxana.ru/kafepupixikitn4ayj.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/B9ijMYT/pefetos.pdfIn PDF document text
    • http://lenudes.com/do_lifters_help_with_deadliftse8k5p.pdfIn PDF document text
    • http://repair-monokoles.ru/timbloader_for_tumblr2b29h.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/piwefodujoxekewoqr8fh.pdfIn PDF document text
    • http://design-kvartira.info/cars_2_cast_with_picturesqh49y.pdfIn PDF document text
    • http://vilopeg.xyz/vapifufuvipbblpe.pdfIn PDF document text
    • http://omshop.space/chacha_bhatija_film_song55t3e.pdfIn PDF document text
    • http://twenty-promo2020.ru/tswr_jc_cet_2019_results6ej8p.pdfIn PDF document text
    • http://soinjaga.ru/death_note_light_and_l29n38.pdfIn PDF document text
    • http://rukozhop-guide.com/vifabidozujoxo3ui1r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekolaxoretewov.epizy.com/icloud_login_finder_apk.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/gas_abolishment_form_simply_energy.pdfIn PDF document text
    • http://sojisij.epizy.com/71844778553.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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 5148 bytes
SHA-256: c19d4f14617bf0bb73460e454ca7754ffeebcd68699ddf5d593cfccc529ca5e6
font_01_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 11016 bytes
SHA-256: 9238199fca27a4ec514d411889f49be4f9faa3488fea53952030618b4169ea83