Malicious PDF — malware analysis report

Static analysis result for SHA-256 61369f31aba7e7a7…

MALICIOUS

PDF

75.6 KB Created: 2021-03-01 09:26:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5e99b7bbc989c9cb79ebbad3ab7a940d SHA-1: 72449d541389cd7250bd7571c27f331341bb550b SHA-256: 61369f31aba7e7a7f24bffbd7ee21ec470acc927050bab8ecf742f1284332115
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 or trojan variant. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('jottigo.ru') that is likely used to host a malicious payload or redirect to a phishing site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=define+different+modes+of+heat+transfer+with+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478669/normal_601a84dc9426b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413468/normal_5ffae87ba1cdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492536/normal_603365c3e40fb.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/1362603.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/ximitusasolujak.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/vudegibuzezemejubak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5fe61e0742247.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/11236248478.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387933/normal_5ff155d946aec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://golujaxi.epizy.com/game_crash_bandicoot_for_pc_portable.pdfIn PDF document text
    • http://beturatigamoli.epizy.com/android_sqlite_support_library.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/asbestos_roof_sheet_size.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/bamuriwi.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/complex_problems_simple_solutions_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/korea_flag_png.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2ED 5440 bytes
SHA-256: 8be77b1b2a24e517697604ef964bbf03b271ed54c5a734f66f0316f7036ad05a
font_01_sfnt_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 11240 bytes
SHA-256: b9ccfd479dc7c02c8ad12ee9b8b8068217d6d626dceeec80dfceef927835abd8
font_02_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 16256 bytes
SHA-256: a5b69a8d497920c409cf89d6d504b51368e402facafb9f5e43d3aa53d606c49e

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