Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b35cddf46ac741…

MALICIOUS

PDF

74.1 KB Created: 2021-03-24 19:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0571b82eb3c86b137526009781d48196 SHA-1: 2068cb0eed855fa58a0031506e5dc526013f1357 SHA-256: 33b35cddf46ac741908f186e09ea82609e1915fee56c56d45d33721e2e57df37
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and potentially malicious domains, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the classification as a link farm designed to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wb?keyword=kindle%20keyboard%202010%20software%20update PDF link annotation
    • https://zulemogosisuwo.weebly.com/uploads/1/3/4/6/134689329/4947596.pdfIn PDF document text
    • http://lifeeuro.info/cuisinart_-_12-cup_fully_automatic_burr_grind__brew_thermal_coffee5u92m.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/lelisekosenozafg5fy3.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/31hhhcP/road_trip_181.pdfIn PDF document text
    • http://rivivivojizejit.22web.org/does_planet_fitness_have_hidden_fees.pdfIn PDF document text
    • http://velesvoyage.ru/english_grammar_book_class_9_10h75s9.pdfIn PDF document text
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/1496841.pdfIn PDF document text
    • http://xtina.online/47998260298xklpr.pdfIn PDF document text
    • https://dugesadodi.weebly.com/uploads/1/3/1/1/131164249/2362436.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/bwabhhM/82325199086.pdfIn PDF document text
    • http://brumbum6.xyz/gurerutaritobuvektcaw.pdfIn PDF document text
    • http://afracheat7.xyz/genki_book_1_downloadtbqw7.pdfIn PDF document text
    • http://zekabivalejasaj.22web.org/48113121166.pdfIn PDF document text
    • http://xivisugewikoju.iblogger.org/92501864509.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jesasudazewur.epizy.com/galaxias_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f04093-828f-4376-8823-21a8028afcbc/nubezadewarokivoxedibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed08f71-ecb3-44d7-a2b9-9f1391c70f8f/boxaguduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ddfa78a-787a-42c6-babc-ecafa34ae5c5/principales_problemas_sociales_en_mexico_2019.pdfIn PDF document text
    • http://tokavasetalan.epizy.com/accidentally_form_a_sentence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f1a1241-5f72-4b0f-84c9-a725d9172e15/how_to_calculate_beam_concrete_quantity.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_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 5728 bytes
SHA-256: f89a737192ae64d94ddb53bbe1c146c5fa4d71d46ba3bfdbbcf3bf82e5c0040e
font_01_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 10956 bytes
SHA-256: d170dc4384b6f9da0f2ad671319e07dca63e3dba68d2450103e5fb65a172c4f0

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