Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda6b8ac849529e5…

MALICIOUS

PDF

69.1 KB Created: 2021-02-17 13:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 09e93a3e2e5cc799e674cc95388960b0 SHA-1: 4bc8807650185715f3dbc34321c399b1c69f13d7 SHA-256: dda6b8ac849529e51dc1773a31c87142b8a027700e947899639ef9af5868d241
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, with at least one identified as a known malicious redirector. The file's structure and embedded links suggest it is part of a phishing or malware distribution scheme, likely attempting to lure users to download further malicious content or provide sensitive information.

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
  • 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://crophysi.ru/strik?utm_term=informal+fallacies+quiz+pdf In PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/MBigNji/music_top_100_all_time.pdfIn PDF document text
    • https://cdn.sqhk.co/zoturisa/pijijje/70_s_disco_music_classics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462708/normal_5ffa3b6a49e6a.pdfIn PDF document text
    • https://cdn.sqhk.co/biwezabob/Ydijpic/5217481377.pdfIn PDF document text
    • http://nakozovuzu.22web.org/xibovoduniz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466391/normal_602994c883577.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/idZZwBk/mininu.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/jcC0RZk/xogonutumojitilegapewama.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/jadawagufunexipab6m5yh.pdfIn PDF document text
    • http://opt05.ru/mogak1axjy.pdfIn PDF document text
    • http://dsv-trening.ru/errorless_chemistry_neet_2020wsd46.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/eZAidih/aquarium_rope_puzzle_last_of_us_2.pdfIn PDF document text
    • http://magnifioco.site/global_initiative_for_asthma_gina_guidelines_20181bwt0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_6008954dc3091.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/gdhfLjd/67609585760.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/fiaXhcQ/virtual_piano_lessons_zoom.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/ieNIwxC/86043918949.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzinokozekinuk.rf.gd/truman_lake_fishing_report_bucksaw_marina.pdfIn PDF document text
    • http://gejebegujisutil.rf.gd/cuentos_de_abelardo_diaz_alfaro.pdfIn PDF document text
    • http://sivojosifa.epizy.com/wikivoso.pdfIn PDF document text
    • http://fakeduzit.rf.gd/chitakli_ghorpad_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21C 5412 bytes
SHA-256: 7c5921524f0e710fa4971539f0b8c5ad44349d167efdec6cee3464a23f455a0e
font_01_sfnt_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 10340 bytes
SHA-256: f3b37c02cc7f37dd1fa7250141e56fc25671ca652a22de42e7f686edd0f1582b

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