Malicious PDF — malware analysis report

Static analysis result for SHA-256 193a73060d34d5f9…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 01:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b18f62b570bb8e58ad90b32e52627de SHA-1: 18ea9917582677519e2e737dc0db8dc2fd934f4e SHA-256: 193a73060d34d5f9251af7a74d6c6c597af79c31c0cffedc3bac2b471fc48589
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. This suggests the primary purpose is to redirect users to a network of sites, likely for phishing or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://mecateengenharia.com.br/ckfinder/userfiles/files/16065260327.pdf In PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/luvedawin.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/52017022602.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/lewamumaxawovijewoz.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/juvexovudegiwevewusep.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/928761390.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/nikit.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912033253792264.pdfIn PDF document text
    • http://bushurov.ru/images/files/xobawuwoxezipuni.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/12516378641.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138799644cf2---30906085375.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/sisuzapesasidik.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-1/20210901165509955186.pdfIn PDF document text
    • http://winso.tw/userfiles/file/bofatezubuxujenisit.pdfIn PDF document text
    • https://forumsevens.com/images/file/26277484636.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/39883925944.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/66395398543.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/72248430013.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/57128902741.pdfIn PDF document text
    • https://ms01bet.com/contents/files/zetuguvutesulovaz.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/pisejawusofogibimaluxej.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/literunagezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+long+after+thawing+is+chicken+goodPDF 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_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 17192 bytes
SHA-256: bd20c1efe5ec7aee4ea4169f397af5bc2bf83a2e65f3fa61cec055d098838ebb
font_01_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 10924 bytes
SHA-256: 0fb9f35147d989ea85ffdec1409bf82b64fe3f3e5c23a4be40de252b3f45dc70