Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff275226138a571…

MALICIOUS

PDF

76.9 KB Created: 2021-01-20 22:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 412b2c2f9258bc5c32b746c09f55ada3 SHA-1: 7d285f6eedc3595b4120d6d24b8f89112f1aa148 SHA-256: cff275226138a571ce47e698333da25752cb995afa97c2cc17332e1dade45f2b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=types+of+maps+worksheet PDF link annotation
    • https://cdn.sqhk.co/ditetona/Knge5YG/baweganexowejezasam.pdfIn PDF document text
    • https://site-1166084.mozfiles.com/files/1166084/deloitte_thailand_transparency_report.pdfIn PDF document text
    • https://sotumeramevoma.weebly.com/uploads/1/3/0/9/130969712/gunodawixuz_baxakuwebidevag_zozekunamajib.pdfIn PDF document text
    • https://cdn.sqhk.co/nenutipu/icpkje0/best_budget_decks_hearthstone_2020.pdfIn PDF document text
    • http://degitowexara.iblogger.org/baahubali_2_tamil_song_starmusiq.pdfIn PDF document text
    • https://site-1168244.mozfiles.com/files/1168244/73086082703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388283/normal_5fd7d027d4f30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_5fe78d13b6610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379736/normal_5fff4ff093887.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/dCUWDzS/fireboy_and_watergirl_1_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/clDeFii/baby_jogger_city_mini_stroller_weight.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
    • https://s3.amazonaws.com/mijumomub/lonely_planet_egypt_travel_guide.pdfIn PDF document text
    • http://povuputuk.epizy.com/jencarlos_canela_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/gupagibuwoleb.pdfIn PDF document text
    • http://zifawikixeliba.epizy.com/vurajasekosezukeg.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/59299426014.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/way_shape_or_form_origin.pdfIn PDF document text
    • http://wufalejopasedor.epizy.com/chirkut_band_new_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 4952 bytes
SHA-256: b4ef37ad30d21a1b20f507e5aa14b5908e3b225f3d8203c0f3977ef82064feea
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 11080 bytes
SHA-256: c648a7e0be55ef562a28ad65652f570a4272ed4d9a5493efc8fb25727b245762
font_02_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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