Malicious PDF — malware analysis report

Static analysis result for SHA-256 7607071b17a20dc9…

MALICIOUS

PDF

90.4 KB Created: 2021-06-14 07:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ea2aa276c889d1bdb0cb66d83412fa8d SHA-1: 40cae65e5551fa36bdad1d4583e1eab8e6b716ee SHA-256: 7607071b17a20dc9957f33531964d625539ef269b1a5b9e77f7fb651079cdf73
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to reference a 'guide', aligning with the link farm heuristic's description of SEO-related content. No scripts were extracted, but the presence of numerous external links points towards an attempt to redirect users to malicious sites.

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/123?utm_term=composite+bow+pathfinder+guide PDF link annotation
    • https://dofewomal.weebly.com/uploads/1/3/4/5/134510420/1588545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_60c6d2ac39134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486743/normal_5fdd395f4f6ca.pdfIn PDF document text
    • https://xuxuroxipekawip.weebly.com/uploads/1/3/4/2/134265976/0bd8764.pdfIn PDF document text
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/jizurinagurur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fdc834a1c65a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463809/normal_5ffb6ff87e046.pdfIn PDF document text
    • https://sofowalomutupal.weebly.com/uploads/1/3/4/3/134310420/6372818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_5fe8390e83146.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/89130c6b-8ec1-4871-865e-4ef2a78554f6/the_human_condition_jon_bellion_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c815ccb5-5e6b-4560-90d0-fd5348b473bf/76711305240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf60c6b-5bbd-4514-8ba3-626b1cc5b4a5/last_of_the_mohicans_movie_reviews.pdfIn PDF document text
    • http://rimogeto.pbworks.com/f/30112668588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25e7e562-d60c-41c8-b16d-4d611910bc89/rukuxeleke.pdfIn PDF document text
    • http://nosegawibaso.pbworks.com/w/file/fetch/145246992/22807044968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18a5db9-ce93-411c-a48c-11df71a410d2/fight_club_chuck_palahniuk_sparknotes.pdfIn PDF document text
    • http://xetuduju.pbworks.com/f/51826740886.pdfIn PDF document text
    • http://masawumel.pbworks.com/w/file/fetch/144789870/99648696145.pdfIn PDF document text
    • http://xobapotowi.pbworks.com/f/grigori_grabovoi_saylar_nasl_kullanlr.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/w/file/fetch/144668706/zusemuve.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/f/adverbs_worksheet_for_grade_4_with_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_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 5560 bytes
SHA-256: d4cf7d0668be2c2ff3ec4432b33513e2d2df818b3898eb26bd67b43b8a5fc2c4
font_01_sfnt_off000137a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A0 10876 bytes
SHA-256: f6a3ca5fa9e68dfe7e44ea3f42bef98f5c896bdfff096f6d60fa32d3bf28f9fc