Malicious PDF — malware analysis report

Static analysis result for SHA-256 90869873f5ae160a…

MALICIOUS

PDF

70.3 KB Created: 2021-06-14 13:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1a8890333d5d46dd52ea801e41347b94 SHA-1: 3b49e8b91f290a6cbdcbf17153781a1cd1bde105 SHA-256: 90869873f5ae160a5acd45610f7e0b2e6fd6e119d91acb3d52b9fae7a784c4eb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://smidgel.ru/pbw?utm_term=entire+elder+scrolls+map PDF link annotation
    • https://kivijakesav.weebly.com/uploads/1/3/2/7/132740669/sezurejofodep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_601643b1ae302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383795/normal_5fed185ee7757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_6057136ea6cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_6050ce28150c6.pdfIn PDF document text
    • https://nonokutofukidob.weebly.com/uploads/1/3/4/8/134872148/tatuju-liregigowutoni-xojojo-zaruvilokibane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xelivolofuso.pbworks.com/f/how_to_use_dr_brown_bottle_sterilizer.pdfIn PDF document text
    • http://vaporezikumu.pbworks.com/f/57594012748.pdfIn PDF document text
    • http://moxulolo.pbworks.com/w/file/fetch/144761997/3754714941.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/f/mawolimiremakazoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ba7da8-979b-4dcc-8e51-1b0d1fcf4967/wisiwimagotijos.pdfIn PDF document text
    • http://vefubop.pbworks.com/w/file/fetch/145258422/nixopewonolowafiwufaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab775b6e-a2ef-430e-b0dd-1b35495883cf/61253034034.pdfIn PDF document text
    • http://wapajuj.pbworks.com/w/file/fetch/145284087/minapufapi.pdfIn PDF document text
    • http://tipewizu.pbworks.com/w/file/fetch/145258470/mike_mentzer_workout.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/w/file/fetch/144760014/writing_practice_activities_for_kindergarten.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_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 5176 bytes
SHA-256: 06ab3047b083cf6d2cda9c19866a4b4203a1618f862c79eb32fedda5d7147ba5
font_01_sfnt_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 9588 bytes
SHA-256: a7dff6f4330a22609e2781d42d5d59866339d0360c5f683b531a0b809b86633b

Open this report in the interactive analyzer, or submit your own file for analysis.