Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49944a2501b7138…

MALICIOUS

PDF

74.8 KB Created: 2021-03-09 07:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f894197c260f8d4f16530983871461b0 SHA-1: 085f76bb697d499bb7aea37f372ba3dcf947b087 SHA-256: a49944a2501b7138a6d50fae0df6218bbb4ee8f20ec43a4a572eee5be2074e48
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to numerous external websites. The document contains a large number of embedded URLs, many hosted on disposable domains, suggesting a tactic to inflate search engine rankings or distribute malicious content. The presence of external URIs and link farm heuristics strongly indicates an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=g+shock+mudman+strap PDF link annotation
    • http://mitutepoka.medianewsonline.com/bidesobibomuguposavevig.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/pasimifoxidep.pdfIn PDF document text
    • http://samozanyat.info/bigazizlj8di.pdfIn PDF document text
    • http://gbarb.me/riwomugivo0suu6.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/jbdhfgr/79045131088.pdfIn PDF document text
    • https://cdn.sqhk.co/wokumima/gigjhcm/new_anime_stickers_for_whatsapp_2020.pdfIn PDF document text
    • http://kebilosudo.22web.org/ffxiv_astrologian_cards_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/fivuwunar/EWChfHG/2289988339.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/beberiwijuk-bogoxulesupar.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/77d961233.pdfIn PDF document text
    • http://presentinsta.online/72029101664sjmsd.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/etiajgM/ponizif.pdfIn PDF document text
    • http://community-day.ru/fokasuluxisifepofa948dn.pdfIn PDF document text
    • https://cdn.sqhk.co/pugipepa/jgjiejb/masaxabifojunerup.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxarufodir/Jfhjhjb/xawek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxowideza.epizy.com/filmorago_app_uptodown.pdfIn PDF document text
    • http://mowigefugitixa.epizy.com/naruto_battle_arena_2_apk.pdfIn PDF document text
    • http://sarutufasiko.atwebpages.com/60910237116.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_off0000e879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 5376 bytes
SHA-256: 73b18e1171fc4b37d11ffb9a3617ab76de546fd8d249c4ccf9f1110c25d3b32a
font_01_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 10464 bytes
SHA-256: bf88ffbf0c72dac79a76d500445c70a69f6acd43c8c04c35e1da301116217b84

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