Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb1d809466e0a5b…

MALICIOUS

PDF

82.5 KB Created: 2021-03-23 13:34:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d3b90a8bff982ce2e187e2e773f1b00d SHA-1: 0ae2bd0fff0495b38b189d7754ccc11db327f1e9 SHA-256: 7bb1d809466e0a5b0ef282c36030a76c2a3fa004fc5be3656f7a581e61bdd2b8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains text related to 'Jeopardy questions and answers archive' and 'wkhtmltopdf', indicating a lure to a malicious website. The presence of numerous external URLs and the ML classifier's high confidence score strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/123?utm_term=jeopardy+questions+and+answers+archive PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469847/normal_601b1804bbe74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498392/normal_6025bc9da4491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_6029a5a3d7d95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486359/normal_5fdf9f0830060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_603a7803c42f6.pdfIn PDF document text
    • http://tejajugumoneton.66ghz.com/13576645260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_f6fbb648d2a543b98144024204180b6f.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_cf0a83c43faa46cfa63eba299402b664.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74851dc0-4f62-4985-ba43-936fd4707ac8/liladinozejavisoxak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce4bdac-0797-43fc-bcde-508c0143d0df/manual_gps_garmin_rino_110_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f8ac461-d4d0-4f73-a591-be61deff04f6/16871663756.pdfIn PDF document text
    • http://rodesodekisivu.rf.gd/nalugew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce9a58f-ae53-4781-ad65-d8fa5391bf93/1976444668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2ad9f10-37e7-4eb1-8fd2-f8b72b663d90/30420808669.pdfIn PDF document text
    • http://nufudojor.epizy.com/77388331198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d7817f2-ef56-4f5d-bcab-5c29da3d62c4/taylormade_r15_adjustment_chart.pdfIn PDF document text
    • http://lovikusikew.epizy.com/borgata_poker_nj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/840520fe-06b3-4903-9e10-186845c468c6/budizuni.pdfIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_dc9fea3269144281b825ebe3e3f29315.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f51ee4-93ee-4e8c-9916-9f2b9dbe62c6/is_it_illegal_to_buy_fake_reviews.pdfIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_9297124a864c4fe0a250da19f66f9428.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e924a1-56c6-42c6-a708-fe3995ca0af2/zusalovekorevisosubifum.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 5496 bytes
SHA-256: c55ee8a1b1cfbeb313b2ddd978c3f90eeebb6efc9154ba95db0b54fe1c180586
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 10900 bytes
SHA-256: cdf92c9bcd14e821a398f212cfc99d3e2c9380c3b560f2abaeb1f0e9857ace41
font_02_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 16632 bytes
SHA-256: c50702d4acfbab276db04c5221898060464ebd298806f96ba401251afed68d5e

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