Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeaf9baa71988d8b…

MALICIOUS

PDF

89.2 KB Created: 2021-06-05 13:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8b4d99c56252e51664d5bf00543850e8 SHA-1: b6b21b89e63eef84dc451f191501e956c58c2337 SHA-256: aeaf9baa71988d8b753fa842f3d5196383a1c6eca68e5af13a280d4ed2186012
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://maypoin.ru/123?utm_term=canonical+pos+form+example PDF link annotation
    • https://pesilukijirizi.weebly.com/uploads/1/3/4/8/134864792/159321.pdfIn PDF document text
    • https://katolafafesol.weebly.com/uploads/1/3/4/4/134479470/34a45b354467cd.pdfIn PDF document text
    • https://foramifetutimif.weebly.com/uploads/1/3/5/3/135347605/revujukewotonubit.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/f73c13d8fb.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/4199277.pdfIn PDF document text
    • https://tarivoda.weebly.com/uploads/1/3/4/6/134693378/finewetexepewago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_6010716e005cb.pdfIn PDF document text
    • https://vojerured.weebly.com/uploads/1/3/3/9/133999986/zinorudawepowed.pdfIn PDF document text
    • https://rusizugijenu.weebly.com/uploads/1/3/4/3/134340450/1786478.pdfIn PDF document text
    • https://kapomubevobi.weebly.com/uploads/1/3/4/6/134681937/6455945.pdfIn PDF document text
    • https://mileboxizabov.weebly.com/uploads/1/3/5/3/135390970/dalasexaxakuzil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386361/normal_5fe56a4fb53a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwofig.pbworks.com/f/1341078808.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/f/90854917913.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144575967/77474583094.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/sitoba.pdfIn PDF document text
    • http://sovamexor.pbworks.com/f/how_to_use_a_vivitar_film_camera.pdfIn PDF document text
    • http://lerepaxa.pbworks.com/f/78548237289.pdfIn PDF document text
    • http://tevimunon.pbworks.com/w/file/fetch/144601512/33302457079.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/blue_prism_mapiex_latest_version.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_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 5136 bytes
SHA-256: f1e1c4f2b70cacdb279957dea8518002719e95634c9f5dad8478336fb7eb7c61
font_01_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 11240 bytes
SHA-256: 633e3d2d827062c114f4b539c273808b68bac334431fe5008e86fe0d8a9d525e
font_02_sfnt_off00014277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14277 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833