Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d78b785ef5faa7a…

MALICIOUS

PDF

78.0 KB Created: 2021-04-16 14:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a2d5d1b0b9982b590eef6d8dfdaee67e SHA-1: 9f802a8dbc32ab8552d69da85b5eba74ec14835b SHA-256: 3d78b785ef5faa7a4a797ae3748644f23a1e89df86994278eeb68d8e5886a35f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate an attempt to exploit users by directing them to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/strik?utm_term=cybex+arc+trainer+model+comparison PDF link annotation
    • http://bojikewexojok.iblogger.org/2008_honda_crv_service_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/fJ6jbic/86171495486.pdfIn PDF document text
    • http://kesisofawa.mygamesonline.org/analysis_design_of_algorithms_arora.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/xahd5ic/gofoxawavenotuluzukek.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/fBo7ahk/monster_truck_driving_games.pdfIn PDF document text
    • http://vepapin.iblogger.org/kigopugi.pdfIn PDF document text
    • http://jidogirikar.mygamesonline.org/gilutotevadidavezu.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/jehfFSD/budigosobamugugafo.pdfIn PDF document text
    • http://zikubuji.iblogger.org/zezeluta.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/oN1T9gd/allen_eight_theatres_farmington_nm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_c0e92da2705244a8b82389829e2ff992.pdf?index=trueIn PDF document text
    • http://xelelurez.rf.gd/78102821894.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_b9eac3cd31044e6abee781e941799e32.pdf?index=trueIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/spherical_bessel_equation.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_3c1f5e867c4447c99bd2bef8e1cf1c22.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_b29a836b67444a3682d2ba24c1bcc963.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_97879f65d3bb497ca1dbd82b25efa24c.pdf?index=trueIn PDF document text
    • http://bosadubarelazu.rf.gd/87455452709.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_93810c41772d4b6f8e97f42cb478b319.pdf?index=trueIn PDF document text
    • http://bovinow.epizy.com/75319163363.pdfIn PDF document text
    • http://fuzaxovojige.epizy.com/the_axiomatic_method_in_biology.pdfIn PDF document text
    • http://nokebubikirog.rf.gd/josolewuwewigowefekizo.pdfIn PDF document text
    • http://luwidegudaje.epizy.com/74736130597.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/zapixapodenopezizasiwona.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_6cd3e4c12cec4efaa85f5d9971a18fb9.pdf?index=trueIn 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_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 5436 bytes
SHA-256: 17e09871bad4c1f9b3ab8b4b77ae2cf28541ceeec9fedb905b6e73e2134f1a12
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 10792 bytes
SHA-256: 82242f63de8a4f9dc28c63ad826e2d2e35575342fe814fa1f5496dcfffae8a60