Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ef53dee3047428…

MALICIOUS

PDF

75.6 KB Created: 2021-02-28 20:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2d25ac3c58632496a9deac880750b901 SHA-1: 5ca92cb4d589279ece6696bc1e071ae3d2e2e189 SHA-256: f7ef53dee304742817040e2b8ae5e8c7859161e533635bd0718450018ed92ec6
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains fragments related to technical queries, suggesting a lure to trick users into clicking on these links. The presence of external URIs and link farm heuristics strongly suggests an attempt to lead the user to a compromised or malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://lozipotod.ru/123?utm_term=why+my+samsung+s3+cannot+connect+to+wifi PDF link annotation
    • http://vowujebotoza.mywebcommunity.org/night_owl_wireless_1080p_panoramic_camera_reviews.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/how_to_explain_personification_in_poetry.pdfIn PDF document text
    • https://nojilanoxejajej.weebly.com/uploads/1/3/4/8/134856497/lixusirunijajozufig.pdfIn PDF document text
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/wojim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491414/normal_6002a37b3ae7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499660/normal_60134f241c083.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/dizuzawifokevimudo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5fe563debb9dd.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/35201169613.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/74982492442.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/vofedorunijolot.pdfIn PDF document text
    • https://vomasixesex.weebly.com/uploads/1/3/2/8/132815370/wowavufa.pdfIn PDF document text
    • https://wenewemegidipep.weebly.com/uploads/1/3/4/6/134679414/3865552.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifavamifikas.myartsonline.com/the_analects_meaning_by_paragraph.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/joomla_templates_demo.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/android_network_monitor_source_code.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/21391789248.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/beruxubej.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_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 5540 bytes
SHA-256: a56143302dfbc98ff0013c6a34a84f89e4c082cb806f4ebbcf67e38d0867d4d2
font_01_sfnt_off0000fd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD63 10496 bytes
SHA-256: c99d51642bd151ab787a63247c1bc6771cbc7df32d71fd1cd2a6c083a5636990

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