Malicious PDF — malware analysis report

Static analysis result for SHA-256 2470f9b5f0a7c375…

MALICIOUS

PDF

90.9 KB Created: 2021-04-15 09:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 33abdf3b2b620a38d731634c4cb519ce SHA-1: c39f8604f32465aa0c5c2cdd50516ec271fbc47c SHA-256: 2470f9b5f0a7c37511656e8fd0cefaf0e3ff0539f760b5f194b24702d847db7e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically pointing to 'baarspo.ru/strik'. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it with high confidence. The document body, though heavily obfuscated, appears to be a lure related to search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=what+exercise+machine+is+best+for+buttocks PDF link annotation
    • http://cashbackk.site/bambino_black_font_freefp6bh.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/wiwudus.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/mazukosikoxekuvisosiz.pdfIn PDF document text
    • http://fitatuvepejozo.sportsontheweb.net/powipogiwutatibasubasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411932/normal_6008c069309ad.pdfIn PDF document text
    • http://kieverts.xyz/25939364657a3p0a.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/sozejusozileteju.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/google_data_studio_download_as.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/suruxevesupofo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388614/normal_5fe10a5b5cceb.pdfIn PDF document text
    • http://dakajak.medianewsonline.com/allahabad_high_court_aro_syllabus_2020_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/42542539104.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/62883014652.pdfIn PDF document text
    • http://rolubumemetujin.atwebpages.com/98726067849.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/tilasadegamopozisalip.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_off000124ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 5376 bytes
SHA-256: d46318ee527cb389e1474a1db686268a5ecc3ac4ae16d65f1286510f5defc57e
font_01_sfnt_off0001371d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371D 11516 bytes
SHA-256: 510e28dc1cab45f0c11dd424a693d7e82a10f71c2ff5c61345ea342d8fba1f75