Malicious PDF — malware analysis report

Static analysis result for SHA-256 1799fc3c0c3156a2…

MALICIOUS

PDF

77.3 KB Created: 2021-04-27 18:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a25c03ce74bc14abd15fac16885488e3 SHA-1: 157acd68d2577db2778d7e1d27c967fa9016e803 SHA-256: 1799fc3c0c3156a2300a7d71fabb942af174e106c9bdefb96cbb59d361fd9ce9
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 0.9997

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://jacksth.ru/strik?utm_term=dead+doctors+don%2527t+lie+book+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457590/normal_602aa47c72220.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/rzlgfNi/sibowawedebiken.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/jdMMCia/ball_dropping_2020_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_605e023280ba2.pdfIn PDF document text
    • https://cdn.sqhk.co/goxufime/ibZUbgf/lorelakolupozolumat.pdfIn PDF document text
    • https://cdn.sqhk.co/zutujodara/aNjeKja/slow_motion_video_software_free_download_for_win7.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/icEVgdK/men_s_hairstyles_medium_wavy_hair.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/vjdfhdX/navy_chief_special_warfare_operator_adam_matthews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_600f20742daa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_601bc52a5dec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491398/normal_6029e8361c72e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fe5016a0d85c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_5fd7004bafeaf.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/dhcgjgh/alone_quotes_images_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fe75d07f2bcc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_4437176cdf9044ba8445528fd4ddc4da.pdf?index=trueIn PDF document text
    • http://lawaradax.rf.gd/32497994712.pdfIn PDF document text
    • http://tozopovudot.epizy.com/mathematical_logic_for_computer_science_lu_zhongwan.pdfIn PDF document text
    • http://buripire.rf.gd/gelivafivufepora.pdfIn PDF document text
    • http://bujazux.rf.gd/datatable_export_to_excel_date_format.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_449118a3acfd4d698830ebb4a2c43fa4.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_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 5320 bytes
SHA-256: 321496c708b9b544913d894da60d9e45d6d0b96318e82be609539e686df2b425
font_01_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 10768 bytes
SHA-256: 9679bfd48924e51f80a859270305e04c7038b9eba8be85a0833d87286f0bd72c

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