Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b2d8f6633c543c…

MALICIOUS

PDF

87.3 KB Created: 2021-05-30 19:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f118df263466e9e1e4d6d3b6e09c1dee SHA-1: 7041f2e67fa4ae107583d483a121edd19c8c3cd8 SHA-256: 57b2d8f6633c543ca03868ca217801d50bb54f584ce1f541ef955e3e7957b540
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services, and one prominent URL, 'https://jottigo.ru/strik?utm_term=do+catwoman+have+powers', which is likely part of a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=do+catwoman+have+powers PDF link annotation
    • https://suvedezu.weebly.com/uploads/1/3/1/3/131379937/6407245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470400/normal_5ffb0ad94760e.pdfIn PDF document text
    • https://pidilamobojuri.weebly.com/uploads/1/3/5/3/135310388/4b4492a31db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_606dfb9578b50.pdfIn PDF document text
    • https://golamusexa.weebly.com/uploads/1/3/1/6/131606818/1375563.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/ad06e8ed1640d81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_6043f6fc63a12.pdfIn PDF document text
    • https://buvonumonub.weebly.com/uploads/1/3/5/3/135304713/sogaxonejudek_gitorepimifakow.pdfIn PDF document text
    • https://doliwalesi.weebly.com/uploads/1/3/0/7/130776147/bomukojovexobir-gudokuxibix-banelafaw.pdfIn PDF document text
    • https://begakidiwadagav.weebly.com/uploads/1/3/1/3/131397934/vetetijuzomaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_6024cbea57a61.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/dariz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490917/normal_60057c3fd497a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391915/normal_5fe0bc28066f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379961/normal_5ffd47248f813.pdfIn PDF document text
    • https://razolonupul.weebly.com/uploads/1/3/4/8/134888498/modimugedimebad_xigev_jivivisarasemup_vuzokewafop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/76f60ffb-e606-40b6-a974-46f3d3e6de30/duwawateva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e2c665-aaf9-43da-a6be-5ca319fe11af/38366710200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf709de-c551-4332-89e6-a7a95f9233fe/14010773314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71ff426-0076-4894-b59d-d4dfad152a44/how_to_edit_html_code_in_wix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43bd9240-1237-4d99-9072-4ee481b96cbb/what_are_the_landforms_in_asia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fab69c2-a6e6-467d-b542-ff2114364e85/27893323383.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 5032 bytes
SHA-256: d033349f4abcf844b38a5138e4478a5ec5875667f23b3ae8a1c9735c83692cab
font_01_sfnt_off00011e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 10552 bytes
SHA-256: 5353fd42dc74632b62bace91df81527ff49eafb7714cbdc7a86e30fcbc186aa7
font_02_sfnt_off0001425a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361