Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3ea356427b11e2…

MALICIOUS

PDF

82.0 KB Created: 2021-05-04 13:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d0c3ffefc617914e6d6db88eb9adeea0 SHA-1: 231f434fcbe11c61b84ecf93c2a259f786a50d93 SHA-256: 3f3ea356427b11e25f8e3b6f349f75684e54b63231cebca676906a5bbf6a817e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malware. The document body, though heavily obfuscated, contains text related to search terms, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=dale+earnhardt+sr+diecast+value In PDF document text
    • http://film123watch.com/testo_550_problemssi6p4.pdfIn PDF document text
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/ab496d985a0713.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/icihcRh/rugasetinalisefaxu.pdfIn PDF document text
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/d1793ce588.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/i8Wihig/25800490950.pdfIn PDF document text
    • http://lapuxuzogu.22web.org/tunukapijumoxozedu.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/iha3xgc/xetafozubitimenoxaledudu.pdfIn PDF document text
    • http://dmdmassage.com/749851738564z4aq.pdfIn PDF document text
    • https://wosufixojiniki.weebly.com/uploads/1/3/4/7/134720754/vudabijitusog.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/halgfjg/monster_hunter_rise_amiibo_amazon.pdfIn PDF document text
    • http://vzroslyh.net/libotetanesezifizanefa5ltm.pdfIn PDF document text
    • http://vashobereg.com/their_eyes_were_watching_god_by_zora_neale_hurston_summaryeiqs4.pdfIn PDF document text
    • https://cdn.sqhk.co/jorevagu/ieTSQhb/advanced_offline_dictionary_apk_download.pdfIn PDF document text
    • http://mrshadow.net/top_100_classic_golf_courses_in_the_ususp9r.pdfIn PDF document text
    • https://tatisosef.weebly.com/uploads/1/3/5/3/135333589/6713514.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6827ac43-f653-4c5c-b88b-ffd0769c06a6/concepto_de_interes_simple_y_compuesto_en_matematica_financiera.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/limebip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/270c2b85-d396-4505-be87-70f54ab6f15d/primo_bottom_load_water_dispenser_cold_water_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/horse_drawing_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/bevakosunagitifabixij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8ff8a8-96c3-4a37-8f45-d32a6ba555ec/tadil.pdfIn PDF document text
    • http://wujuxupizosafe.rf.gd/game_templates_unity3d.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/21871207723.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/74221922203.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_off000102af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 5088 bytes
SHA-256: a19bfc5d0ebd82663dad9f5514e1f3ef0b2e8e57c32ded38af8a9914e8326c8d
font_01_sfnt_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 11424 bytes
SHA-256: 29d506c072f7c140e5d56fc16bd7c7a2a3e1cf8c7417f69a6f77b00b1a6e4753