Malicious PDF — malware analysis report

Static analysis result for SHA-256 213087b42fc11a85…

MALICIOUS

PDF

70.4 KB Created: 2021-01-11 12:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77f85c4d724906afba817a3c09cd04a6 SHA-1: 76fb760a8e50d29811a2e96219c759932b1c7264 SHA-256: 213087b42fc11a85da2489d00a55ac44009353adb587b7e512e8757a45a15aff
184 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable domains and known malicious redirector infrastructure. The primary goal appears to be directing users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings strongly indicate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://gettraff.ru/aws?utm_term=amri+butterfly+valves+pdf
    • https://site-1203694.mozfiles.com/files/1203694/dreamers_by_yuyi_morales_read_aloud.pdf
    • https://static.s123-cdn-static.com/uploads/4489411/normal_5ff3211c91a24.pdf
    • https://cdn-cms.f-static.net/uploads/4417530/normal_5f9c9d76601a2.pdf
    • https://site-1166621.mozfiles.com/files/1166621/final_fantasy_crystal_chronicles_remake_switch_price.pdf
    • https://site-1173271.mozfiles.com/files/1173271/rupav.pdf
    • https://site-1171987.mozfiles.com/files/1171987/mimidudotekaka.pdf
    • https://site-1168077.mozfiles.com/files/1168077/pagar_mi_factura_at_t_por_telefono.pdf
    • https://letalisukom.weebly.com/uploads/1/3/4/3/134316231/9348022.pdf
    • https://site-1211537.mozfiles.com/files/1211537/never_have_i_ever_questions_18_card_game.pdf
    • https://site-1177969.mozfiles.com/files/1177969/zekulibulunumokefu.pdf
    • https://polisurev.weebly.com/uploads/1/3/0/7/130740145/gokerubejolelotizit.pdf
    • https://site-1173664.mozfiles.com/files/1173664/house_flipper_hgtv_dlc_switch.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/genedonapubefe/2019_cute_printable_monthly_calendar.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d573.bin
b33d186a5e521cfba6d6133d3059890d2e07b331fb9016f024806430e6f71827		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 5476 bytes
font_01_sfnt_off0000e803.bin
bee70207660ebe9b5032c87c94a220efb2a72c502c0185e9e408787235ec98f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 10700 bytes

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