Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff845d3462e2ff0…

MALICIOUS

PDF

112.0 KB Created: 2021-03-16 15:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9b4df112b9aa344fd72fdff831530e8e SHA-1: 9149e5b1473a74c9e9e56163eb71ff1a06172a90 SHA-256: fff845d3462e2ff015fd8ecf6ba4afd34a6a46bb172d02f8940f699a3db3a925
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=takagi+t-kjr2-in-ng+installation+manual PDF link annotation
    • http://lamanixumerad.mypressonline.com/senior_project_manager_salary_dallas_texas.pdfIn PDF document text
    • http://bitividap.22web.org/picadora_de_forraje.pdfIn PDF document text
    • http://dusipoweg.mywebcommunity.org/25517980654.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/ce6dc1e1-4dbd-4e82-82cf-00f72c9a832f/23092344267.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_06fa61619e624490a250b6cfbdba928c.pdf?index=trueIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_d018f089960c4345aab1344df02984e1.pdf?index=trueIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_8bfd36dce5de4f14b8bafc82ec3477a9.pdf?index=trueIn PDF document text
    • http://jodolevuvik.epizy.com/chola_ms_claim_form_part_a.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_f302877b40da45d684adda34636d51e1.pdf?index=trueIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_1aeef9f6e84c447fa3efb034f385d8d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98741b73-7c44-4800-821a-6e45ed140b74/what_books_are_excluded_from_the_protestant_bible.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_a31b89a9647842a88597dac606525b9b.pdf?index=trueIn PDF document text
    • http://wopevuxapajipek.epizy.com/is_the_big_short_movie_based_on_true_events.pdfIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_3c3acbbda57649ba8567f5663c2e1bba.pdf?index=trueIn PDF document text
    • http://jowelipap.epizy.com/apache_poi_read_excel_jar.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/19572933932.pdfIn PDF document text
    • https://8607b5f8-c2b2-49b7-a314-b17bd4efff40.filesusr.com/ugd/d99252_0958749a737440e8ba20b1b6d1b5e149.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000156c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C4 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off00016106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16106 5260 bytes
SHA-256: 5a8bb6b4c3c963f2e69b963e6e19677547d1b912c5ff24305a8547e530f50004
font_02_sfnt_off000172e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E3 11680 bytes
SHA-256: 97339f32380274224435c13b7fb4036ca9af3094121684c9e8bd1f3ddd0762c0
font_03_sfnt_off00019ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AE5 16172 bytes
SHA-256: fba8513c57599675e00e31eaecff15376c75f8283ffc700610ff06606a8ec4fd