Malicious PDF — malware analysis report

Static analysis result for SHA-256 915d215f6cb96f04…

MALICIOUS

PDF

76.7 KB Created: 2021-02-22 15:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4b18dc7bd1def101aee2d207e88d56fc SHA-1: 417b9c7ceb9ccf5136135156b71ff4338e9c771f SHA-256: 915d215f6cb96f04151bc2db51e28279149956a8089070725ed377a47cd3ba61
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button heuristic further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=andromeda+strain+chapter+5+summary PDF link annotation
    • http://foyou.store/84037289003vkzmr.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/jeCIMOc/mens_hairstyles_long_hair_professional.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/2014549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414167/normal_601bb09f26b12.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/rigBXnA/551764414.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/VuifjbY/46087691090.pdfIn PDF document text
    • http://carins.info/bridgedale_hiking_socks_size_guide0xcoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493201/normal_5fd0baaf4c512.pdfIn PDF document text
    • http://dkmz2.club/kpop_store_in_usa_coupon_code3va8b.pdfIn PDF document text
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/gewujogopo_wasuwasular_tapiwiz_selov.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/gihdghC/88164679110.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/E0UmDjf/hair_cut_3d_sound_mp3.pdfIn PDF document text
    • https://vowemiwa.weebly.com/uploads/1/3/5/3/135392560/fovijisirax-lewutipen.pdfIn PDF document text
    • http://xisulekotitis.iblogger.org/56581768477.pdfIn PDF document text
    • http://anrostore.ru/tarek_ahmed_reservoir_engineering_handbook_free_downloadokox0.pdfIn PDF document text
    • http://zageketukux.iblogger.org/86552599109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_6013c3b0515c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidujujesux.rf.gd/57497246862.pdfIn PDF document text
    • http://dolifusekaxug.epizy.com/41213842695.pdfIn PDF document text
    • http://dilopopizepirem.epizy.com/grammar_practice_for_esl_students.pdfIn PDF document text
    • http://jarifixe.epizy.com/21565893727.pdfIn PDF document text
    • http://sevawudefogu.rf.gd/cartoon_hd_apk_uptodown.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_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 5496 bytes
SHA-256: a7a99a1ba1866276d74eb7634916e9561b86d13db5ec74d59c9619a9e8c7b603
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 10288 bytes
SHA-256: f7fa702854662da89116ec1a35a896030dda41b843f64284c39f67b9907010f2