Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1d8fda69865bb3…

MALICIOUS

PDF

76.7 KB Created: 2021-03-01 02:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7d2a1cd8d6a1d21dde470d51a7d71205 SHA-1: 058a11264c4fe0423345115a582af58eb90a4ab5 SHA-256: ce1d8fda69865bb3fc5b70109d8c479f1875cb80ff86b7a671ec5b14adda95a5
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 detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document is part of a network of disposable sites designed to host malicious content.

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=my+samsung+tv+will+not+connect+to+wifi PDF link annotation
    • http://sowoxapexemex.sportsontheweb.net/how_to_interpret_arterial_blood_gas_results.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480161/normal_5fffcc191b1f2.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/why_is_my_honeywell_thermostat_blinking_leave.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/human_resource_management_functions_include_all_of_the_following_except.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/95758620659j10e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_600b171c2d85d.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/paragraph_structure_worksheets.pdfIn PDF document text
    • http://my-favshopf.online/219726311917lxxl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465704/normal_6006ef6bb786c.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/mtd_snow_blower_wont_start.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481406/normal_5fc63986ec20c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/13566570726.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/frigidaire_refrigerator_parts_fghc2331pfaa.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/greenhouse_effect_ppt_presentation_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 5364 bytes
SHA-256: 04bb0bb5529917ed5ecc271720862ad26be863d79fed76e45abbe879eccb6c21
font_01_sfnt_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 10312 bytes
SHA-256: e2d815f39a5a582e536c16e06cacbe47978998e8338ca604f17f8f26edd3b5a0

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