Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b4b04437eaf4df…

MALICIOUS

PDF

80.1 KB Created: 2021-01-27 06:21:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ad2412d725b78a3dd27c8139cab18307 SHA-1: 29997903f4813cb8cbd662dd9b62b66ce8892553 SHA-256: 73b4b04437eaf4df8283cc63d790345fde7422216b9e30926f36abb084e084bd
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or redirection attempt. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'cable tv guide', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/aws?utm_term=arcata+cable+tv+guide In PDF document text
    • http://wiinorama.fun/43547404876r6434.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/6175048873f8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401696/normal_5feaeb61d4992.pdfIn PDF document text
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/werajovezi-nomazetubepuwod-dawefo-zutet.pdfIn PDF document text
    • http://lorutupaxuposu.22web.org/gijixabilatewo.pdfIn PDF document text
    • https://mogewojelepa.weebly.com/uploads/1/3/4/6/134681452/diserigajaj_vajot_xekesonaxezo.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/94306890489.pdfIn PDF document text
    • http://vinnipoh.space/mogosevgp2q.pdfIn PDF document text
    • https://wezusutuxalik.weebly.com/uploads/1/3/1/6/131637092/f304c47f.pdfIn PDF document text
    • http://vovality.club/ewallet_pro_apklbfrq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wapudajikipidem.epizy.com/baadshah_audio_naa_songs.pdfIn PDF document text
    • http://keximatefabuzi.rf.gd/rudonobegat.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/akhiyon_se_goli_maare_movie_filmywap.pdfIn PDF document text
    • http://bavidatesudujig.epizy.com/40457907832.pdfIn PDF document text
    • http://kivekedifewu.rf.gd/canon_speedlite_430ex_ii_user_guide.pdfIn PDF document text
    • http://karifopiti.epizy.com/tratamiento_para_absceso_dental.pdfIn PDF document text
    • http://desazibali.epizy.com/berizezisoronam.pdfIn PDF document text
    • http://guxozuzemonixe.epizy.com/general_dynamics_information_technology_address.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_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 5120 bytes
SHA-256: b6369907447eeac38122bed0b4ea85a4737c31152df5c42b1c2c0f0ba130af7e
font_01_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 11076 bytes
SHA-256: eb76f179b1b93a33ac62e54289403fdd2d27471112a464d0c6ec215d79e63b85

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