Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad9c75f5cbd9979…

MALICIOUS

PDF

78.0 KB Created: 2021-06-05 21:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8eba82db9e0fe97e4ed1fc205d6db856 SHA-1: decda84506763301031e9a0dc35976e50fad38dd SHA-256: 9ad9c75f5cbd99794371f5ae7664ff63887e7bd93de03d538f5fe248d2b1dbc6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://allytemp.ru/pbw?utm_term=calvin+and+hobbes+comic+books PDF link annotation
    • https://fovofenat.weebly.com/uploads/1/3/4/4/134489119/2672c69.pdfIn PDF document text
    • https://wuwejinetuna.weebly.com/uploads/1/3/2/6/132681176/jogubufog.pdfIn PDF document text
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/xewir-kaduzifiwomi-keposovot.pdfIn PDF document text
    • https://dutariviwasupor.weebly.com/uploads/1/3/4/6/134610277/2615831.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/2424099.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/numubezixoworab.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/60c32898-943a-4231-b069-081fcb85cd8f/what_is_the_story_barn_burning_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08fab14e-25ca-455c-a8cf-bf9058f747f4/nikebomosenulig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97884176-7dbe-4a28-9d5f-f86cb538f8e8/different_types_of_volcanoes_worksheet.pdfIn PDF document text
    • http://likanegi.pbworks.com/f/brahma_kumaris_shivani_books.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/45496496315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1d414d-5c09-4bc8-ac4e-484ae83f9060/brawl_stars_apk_ios_iin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ccd7534-432f-4e77-a5e3-353bb142f344/29367241182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0302d45d-2928-45b0-9f02-bb4430b961da/integrated_chinese_4th_edition_volume_2_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e860b5c1-bb2f-4ad0-a922-7e7ddaff8c27/when_the_sun_shines_we_shine_together_karaoke.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/analyzing_the_red_scare_worksheet_answer_key.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/interpreting_double_bar_graphs_worksheet.pdfIn PDF document text
    • http://naxenuve.pbworks.com/w/file/fetch/144479334/wobisinanijafox.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_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 5252 bytes
SHA-256: 0d7dc1a6276c9f8ab6c79c89cc40a78f342e7cf0e3d38b60d87ceef1e1531a4b
font_01_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 11388 bytes
SHA-256: 2802ec182c406161a8be9fa6e4f1dc42bf08b4a5f0654ee1e23151fe1a96f6b6

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