Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cba81dc06ba8e4…

MALICIOUS

PDF

123.3 KB Created: 2021-04-09 15:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 42772c798993f835ea14a630b30fc16f SHA-1: cddda5ac50e7b3ce0cbb8090c50d1e5f54512f17 SHA-256: c5cba81dc06ba8e444d24c6c4d8abb74a571017c30707f46bed80ee2f393e807
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/strik?utm_term=traitor+legions+contrast In PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/momajipajus.pdfIn PDF document text
    • https://fifikasato.weebly.com/uploads/1/3/1/4/131437502/8152335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_600c655029af2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417039/normal_5fcddd5504718.pdfIn PDF document text
    • https://fokurojisek.weebly.com/uploads/1/3/1/4/131438639/zotetezigosep-dijoragerito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412173/normal_5ff7cf83cd343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_6017b2aa3060c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_605fa2ea0fef2.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/antonyms_worksheets.pdfIn PDF document text
    • http://berozabekep.sportsontheweb.net/supov.pdfIn PDF document text
    • http://rolorutebu.sportsontheweb.net/what_to_name_your_guy_friend_on_snapchat.pdfIn PDF document text
    • https://wobadudubabu.weebly.com/uploads/1/3/4/5/134510413/satulitidok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gikikojumikobep.epizy.com/donald_knuth_literate_programming.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/what_cords_can_charge_a_ps3_controller.pdfIn PDF document text
    • http://derajovaku.rf.gd/eenadu_calendar_2020_telugu.pdfIn PDF document text
    • http://zedaziwubisod.rf.gd/13222638793.pdfIn PDF document text
    • http://ziketikivanodiw.epizy.com/79286585423.pdfIn PDF document text
    • http://subogerilazelo.atwebpages.com/49453838986.pdfIn PDF document text
    • http://memonexato.epizy.com/essential_mcqs_on_clinical_pharmacology_and_therapeutics.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_off0001a94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A94B 4916 bytes
SHA-256: 327f99076d159ea4d489c1162574b343a9240887996babab55d92b282712ce42
font_01_sfnt_off0001ba12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA12 10992 bytes
SHA-256: 2b7ceb92554fe7a8ff23a10e88a54e89d628f2fa97bd6d130000ee25e7976f83

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