Malicious PDF — malware analysis report

Static analysis result for SHA-256 504a94b6e1ff7bf5…

MALICIOUS

PDF

88.3 KB Created: 2021-03-18 16:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d3b945d0033ff29cbe33b0bd375a0b29 SHA-1: 791e35d40ee3bc77a00150abc50ec2e28db83fa7 SHA-256: 504a94b6e1ff7bf5be47625b6b99ccb152576cb0054d38bc6eb299e2c7db1256
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, with at least one, 'https://maypoin.ru/strik?utm_term=ti-nspire+cx+cas+software', appearing to be a malicious redirector. The PDF's structure and the presence of multiple disposable hosting links suggest a link farm designed to obscure the ultimate malicious destination, likely a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=ti-nspire+cx+cas+software PDF link annotation
    • http://bigmagazin.xyz/52471203706nad0j.pdfIn PDF document text
    • http://vbruti.site/66975849423y369i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_5fd7c840dd720.pdfIn PDF document text
    • http://optarfes.com/kekudakutogatevgydh2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_60101ec04d392.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465262/normal_5fc77858ef6a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426810/normal_5ff1f5d988301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fe802fae3237.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosaras.rf.gd/scrabble_game_dictionary_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/bufagekadafalasiwojagof.pdfIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_31b6156fb8ac48b9914057787311f73f.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_3f018b30e1804859a9fc8750e4b34254.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cb6e5f3-246b-4732-a66d-3c540e771af6/32995312718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a971a13-d3a2-4616-8d20-0f29f2dc47c3/jaxuwubabidevu.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/35042259771.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/vadararotopeju.pdfIn PDF document text
    • https://4c69d07c-928c-405f-a1ab-6436392658c4.filesusr.com/ugd/4c264d_ea4b4f3d252741b3a5cd9dd5075d7cc4.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_896b8a0923bb43e4a57d2fb52fd1c41e.pdf?index=trueIn PDF document text
    • http://repajazofuwide.epizy.com/40628608315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52bad2f3-0fcb-4b48-ae96-3ae273ed7c25/ge_front_load_washer_error_code_e46.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_7e4814b830644e0683f3f8fe3e58472e.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_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 5116 bytes
SHA-256: a6952aecaba62fa1ebd76ff715e1bc283d33003931d958dc25c4b0504968c5aa
font_01_sfnt_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 11236 bytes
SHA-256: 5b4181493e5db8defa3daa27fa4f21766fd6685eecd2eacc8db1f5dda55d675b

Open this report in the interactive analyzer, or submit your own file for analysis.