Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdf3258a42e62d9…

MALICIOUS

PDF

75.6 KB Created: 2021-03-28 00:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 65bd4c7eb2958049c379adb45cd2e41c SHA-1: 9b4cc258664b12a522330f4002c0f429fabafeca SHA-256: ffdf3258a42e62d98cca525adfb58c7b2adc9c7ef8961fcfd7147d7cc7c468b7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crophysi.ru/123?utm_term=colonic+pseudo+obstruction+guidelines PDF link annotation
    • http://bigtittybella.com/22762628769d5z59.pdfIn PDF document text
    • http://tovelksa.website/hatsune_miku_tap_wonder_guidety72h.pdfIn PDF document text
    • http://wisitens.online/fakineluzawijekijutoonr4.pdfIn PDF document text
    • https://denagivar.weebly.com/uploads/1/3/1/3/131383646/sadomexog-wasekox.pdfIn PDF document text
    • https://nebavorod.weebly.com/uploads/1/3/1/4/131406600/doxupabujonafoxoketa.pdfIn PDF document text
    • https://kutepuwabaluv.weebly.com/uploads/1/3/2/6/132681670/jefowoda.pdfIn PDF document text
    • http://romeita.space/como_construir_una_bomba_de_ariete8xewb.pdfIn PDF document text
    • http://mosquito.codes/mack_e7_427_torque_specsos4bd.pdfIn PDF document text
    • https://jutokikifugata.weebly.com/uploads/1/3/1/0/131070124/a967e8.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://amorexpo.com/hanuman_chalisa_ashtaku596k.pdfIn PDF document text
    • http://creditscorehelp.info/jewipelowojirijezetezadx1hfd.pdfIn PDF document text
    • http://copyright-help-center.com/74362066081q4q5j.pdfIn PDF document text
    • http://livecopyrightverification.com/zewatanafipurfwnyh.pdfIn PDF document text
    • http://lavka-karamel.ru/database_systems_the_complete_book_solutionsmu4fc.pdfIn PDF document text
    • http://contact-git.top/rotototefezirusuct0rh.pdfIn PDF document text
    • https://dutatofe.weebly.com/uploads/1/3/4/4/134471766/cd5d9852f2ffe7.pdfIn PDF document text
    • http://on-arenas.com/escape_from_tarkov_ammo_chart_offici2gmk8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_09f5ce32e8bb4f398f1f7d1435ba7832.pdf?index=trueIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_ca755a044608401993e305414f0d6d6a.pdf?index=trueIn 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_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 5076 bytes
SHA-256: b96981aa840229de29bbcf16f7adb6adca8de59cfa6104850a759692379bfa32
font_01_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 10540 bytes
SHA-256: c3b0e69e7651a4d1ac202a12eb3c07fdbd5d0c9983cd62b54eea83c43887540e

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