Malicious PDF — malware analysis report

Static analysis result for SHA-256 5182a36d35a9fdcd…

MALICIOUS

PDF

75.3 KB Created: 2021-04-23 04:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fb6225fbc2299eb048ee714acadf46bc SHA-1: 3cfbc92527501ed4a945bd19f4d38c0357ed6fdb SHA-256: 5182a36d35a9fdcde15c27698efc4c6cb7a4c19755dfd773afabac119425b8e0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and potentially benign content, suggesting a link farm or SEO spam operation. The presence of a specific URL related to SAT subject tests, combined with the ML classifier and ClamAV detection, indicates a malicious intent, likely to drive traffic to malicious sites or distribute further payloads. No scripts were extracted, but the PDF structure itself is used to host and link to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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=how+to+prep+for+sat+subject+tests PDF link annotation
    • https://zodaribidibukez.weebly.com/uploads/1/3/4/7/134716266/7d70e.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/58cf91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_6037674f88c61.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/1009739.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/jiichfQ/dead_meat_premium_endless_zombie_survival_games.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/OibiaGo/4851389031.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/hiyJbji/azamara_cruises_2020_mediterranean.pdfIn PDF document text
    • https://tawafijagipuju.weebly.com/uploads/1/3/4/6/134684871/xitevatusaxidi_xifofemejinu_dinik_gufelefikoze.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/gfzVO9x/wuteri.pdfIn PDF document text
    • https://mivopolidenez.weebly.com/uploads/1/3/4/3/134349928/vizowurufejeda.pdfIn PDF document text
    • https://cdn.sqhk.co/tidilotofuka/cigTjfq/32296018658.pdfIn PDF document text
    • https://tajudazu.weebly.com/uploads/1/3/4/3/134328852/eb73d87a4bdc96.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/XoAZjdr/foe_helper_2._4._6._2_chromebook.pdfIn PDF document text
    • https://buruwezixefekiw.weebly.com/uploads/1/3/0/7/130738548/zovelevaxoxuwa_mexaji_fomidiwaj.pdfIn PDF document text
    • https://zatakigufexip.weebly.com/uploads/1/3/0/7/130738978/5226803.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414331/normal_6000a258804cb.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/gdKgjbH/43745605993.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/simujix/falomujas.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/falanum.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/baahubali_2_tamil_video_songs.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_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 5244 bytes
SHA-256: d93034cb4188b65e4b310675162bfedee25b462c005c523b74e6442e02848fea
font_01_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 10788 bytes
SHA-256: 35ec9dfbbcc31294a951db30a8b885fb77d6fec3b81d8ea971cca622e409c80e