Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d854755f539e95…

MALICIOUS

PDF

77.3 KB Created: 2021-02-19 22:08:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: e2412210af2b30b0cde40e64b3bd4d94 SHA-1: 0259a2324509663439dddd6014a19069128e6ffe SHA-256: 05d854755f539e951d9d9e55a66d3a3aa342ac9ffbc5f7c4d5fb19f5925ad84a
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, many hosted on disposable domains. This behaviour is indicative of a link farm, potentially used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, and the presence of embedded URLs aligns with techniques used to redirect users to phishing sites or download malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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 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.
  • 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/wix?keyword=mighty+joe+magarac+story In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5fd29f6b151aa.pdfIn PDF document text
    • http://epaytds.xyz/caremark_prior_authorization_form_for_modafinilxqrsg.pdfIn PDF document text
    • https://gidedumewulo.weebly.com/uploads/1/3/5/9/135961218/7335597.pdfIn PDF document text
    • https://wigowuwadapol.weebly.com/uploads/1/3/5/3/135315864/vazurinepevafebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_5fe8dfa27709b.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwonukunav/iZJBroo/43378805661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491426/normal_602422aa8ebf5.pdfIn PDF document text
    • https://cdn.sqhk.co/tosijoxopum/bgclYhc/57268521974.pdfIn PDF document text
    • http://bhd-management.space/91159007357k59e.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/A1icgco/minecraft_world_seed_pewdiepie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416654/normal_5ff9c4d7a174d.pdfIn PDF document text
    • https://cdn.sqhk.co/lesebonun/3idha8v/kevebubifupadal.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/fE1gcha/.pdfIn PDF document text
    • http://betflixguvenilirmi.com/ram_reliability_availability_maintainabilityk8dqj.pdfIn PDF document text
    • http://avit0.cc/wopofuraxiwa1yvbv.pdfIn PDF document text
    • https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/5770672.pdfIn PDF document text
    • https://nudesobaxoxis.weebly.com/uploads/1/3/4/6/134666739/5320ef.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/iedggjf/cerastus_knight_acheron_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/ladetozuxi/hgVIgfA/33619274214.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485704/normal_5fee90bc341b2.pdfIn PDF document text
    • https://cdn.sqhk.co/vizebika/Ehg42ZI/kaviremawirov.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/hjVhihd/64396974774.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijazujarakowom.epizy.com/wowatitexokugir.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_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 5364 bytes
SHA-256: e7a841814c166d2646d4ed86f7743a9df3cf9eb08d2734b8fed25e26664c572a
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 12508 bytes
SHA-256: 57f10f9e02b6884e32d81279ae01ece3c4d6fdb54a94171528bfec2798cb5c4a