Malicious PDF — malware analysis report

Static analysis result for SHA-256 131df63161c4269b…

MALICIOUS

PDF

87.2 KB Created: 2021-05-13 17:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1865b04b44752ddab2f309ff44f25e32 SHA-1: efb7090a94d04f24210e24c6df9bd2624baaa003 SHA-256: 131df63161c4269bfac0d5ededbfae6e8cf3d0ee54ece9760b68dec1fd0f1ad2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to research topics, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dugedepap.ru/strik?utm_term=what+is+the+difference+between+qualitative+and+quantitative+research+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373271/normal_60185220610fd.pdfIn PDF document text
    • http://jajolamuseku.medianewsonline.com/tapudugavuzujozazegos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_600e748377475.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/fadujorutarepimonuguz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493890/normal_5fce948fcf8b8.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/60558013225.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/26988645237.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://likewiwojuxus.atwebpages.com/fumadasawi.pdfIn PDF document text
    • http://xerobesufeworep.rf.gd/annamalai_movie_in_tamilyogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00454e41-e984-40d4-a626-d9b453bc8596/39244340722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b12a1ef-8ae5-4547-bf36-c6df18894770/hx_stomp_update_firmware.pdfIn PDF document text
    • http://parorusoba.rf.gd/wubufutuvev.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/fipazanesumudujar.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/84116629986.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/muxipazegapiguxuvubi.pdfIn PDF document text
    • http://jebajenalow.epizy.com/english_speaking_questions_for_beginners.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/50095422151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/961f57e6-5d76-4c3c-b068-26cb40d8721b/logenajedutarabefejekan.pdfIn PDF document text
    • http://gelifadewew.rf.gd/rutiwepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f458cbb-fc3c-4a64-9c2b-1b384f4c6c5d/zutowidakifigavivalu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/thomas_ligotti_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e46f5c-8ea1-4039-a94b-99e5a6ccf32e/essex_bus_route_3.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 5444 bytes
SHA-256: ede96631c9dc938cea28dd1de8d752132c235aeb15541a18367767c1fcea8c50
font_01_sfnt_off0001077e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 10568 bytes
SHA-256: a8011eac1bb39b8081e1405707312ab1c2998dc9a28041eddd10ceb277b9b2ca
font_02_sfnt_off00012ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA5 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1
font_03_sfnt_off0001400d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400D 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71