Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa20171b722fd435…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 23:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64bf84a9999eb78352b2cf65f50054a8 SHA-1: e80f0967d8a82c300ec4c179c4ee4b18343c8903 SHA-256: fa20171b722fd4353df0ce8d79f924856661949d304a2509fc5e074bc7496f86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 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 http://ajej.pretty-match.com/upload/files/tizaketodib.pdf In PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/14613641237.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/ronubugavepirosoj.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ab0c28749592deaf8b1a6a197e60aa71/rinaribodew.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/79345873835.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/40704631002.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/rojane.pdfIn PDF document text
    • https://fong-cai.com/upload/files/mufelenizoxugomi.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/zubopifikopajoremigaviro.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210911_25AA2A0E06D63719.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/nukow.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/lipadatoduto.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428ac818e8b---10583149937.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/mitazomomekoj.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/94602164118.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/84254031164.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/luxasugo.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/noror.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/xakalirugobavobufos.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/talumez.pdfIn PDF document text
    • https://baongochoa.com/upload/file/sunolisuzuvixopivofosuw.pdfIn PDF document text
    • http://bamor.org/userfiles/file/35559287970.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/43010246762.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/valukaribulopidepas.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/63972469755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=widget+smith+ios+14+for+androidPDF link annotation
    • 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://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_off0000c650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 16952 bytes
SHA-256: f2f1463a10440383d9352f8b0e80476855769dbe27b1b90f92df682d60c65067
font_02_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 10880 bytes
SHA-256: 059f3d0081737ae3921b0b85674c5e6d30e8be22ea3eef3a9dcab86cd4dede22