Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1abb37f78d6aa35…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 02:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65f1a682502c8748e4201a61122b34ca SHA-1: 1d6c65f69d0a96c1840001d4c45d5abd40c9c0c1 SHA-256: a1abb37f78d6aa35b9f0696000731244662c03b96bc70db7c17cc76a57750dd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a deceptive web presence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://prasongp.com/file_media/file_image/file/1305698331.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///pegurulow.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/17704812971.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/93829653749.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/nikikiwamaw.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/84004187056.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130b460cfe7b---masakasefajodafonemomero.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/23344683135.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/tigitazevusetikox.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/27367987060.pdfIn PDF document text
    • http://toonesk.com/upload/18622414717.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109110421357412.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148c60058018---fakobipidan.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/janojomexaxadulena.pdfIn PDF document text
    • https://morabia.fi/images/file/bogabudifanozurizowaze.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146d39f70a2e---6521457869.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/45430140147.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/50215160795.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/86805813892.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/pudokujowisejirojer.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/20357041014.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/23609359635.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/55906086471.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/66395185673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=running+activex+on+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_off0000e1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F9 10644 bytes
SHA-256: fd7fd4b9be4a330fbe66fc670d19661a40a9c3ccbe5adb109aa3dc7cadad4b66
font_01_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 17444 bytes
SHA-256: ef079489ad97e51953fcc3ba7f70ee8823fcaf05a250535a478905e5e206f520