Malicious PDF — malware analysis report

Static analysis result for SHA-256 8909b7d040c1bb73…

MALICIOUS

PDF

83.6 KB Created: 2021-03-24 04:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7cbe632cb3ea7668a629645e3ff15b72 SHA-1: cabaafed0104b300528bcdb35aadb20fb4a12eba SHA-256: 8909b7d040c1bb736780a3780668338dd1ac35740bb626a050c39dc76b390a82
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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
  • 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://jacksth.ru/123?utm_term=forecast+sales+report PDF link annotation
    • http://ejqy.com/harry_potter_undesirable_poster_templateevtnm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393503/normal_602ba4f965de7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5feb0bd22ee90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_60167070623b1.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/frosty_the_snowman_original_song_lyrics.pdfIn PDF document text
    • http://fruit-ital.space/nct_dream_fireflies_sheet_musicemjn2.pdfIn PDF document text
    • http://mynasert.online/how_to_use_mendeley_effectively3ucxt.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/96414100582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497075/normal_600ade417c150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_6000ea583bdef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_604d3dbea1569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_603b24490c317.pdfIn PDF document text
    • http://logawedulukudan.mywebcommunity.org/59532830576.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462696/normal_5fc7a806eae8e.pdfIn PDF document text
    • http://sodalabs.club/jomiloriud9g7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464874/normal_604ecbdf22afa.pdfIn PDF document text
    • http://fituxem.sportsontheweb.net/wijisefexu.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/49830481135.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/3fd38ca1-13ad-408b-84e6-e62826af032e/which_colour_is_best_for_day_function.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/zoruvosolanala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d952d96-e660-493c-b4a9-d902defc369e/pufasa.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/read_theory_analogies_3_level_8_answers.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_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 4884 bytes
SHA-256: 763b2a724047b24dfe351e7fdaea8d16e3cc236ece019d3c8920eec23546ccc9
font_01_sfnt_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 11032 bytes
SHA-256: 364dc69ad2e9c837ae8d095dd704750a0a7ec5f4f21cf935c6f9189211f42812

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