Malicious PDF — malware analysis report

Static analysis result for SHA-256 95eb7fe263498fe9…

MALICIOUS

PDF

75.0 KB Created: 2021-02-18 09:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a62cdc97c08636fe2506d566dc84f4e4 SHA-1: 14a42d64fe0582145a21cdfe8eba7497e1142967 SHA-256: 95eb7fe263498fe9bf1e8b3585269cc9733b197b546d4f634d1c89f59082bf1a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs. The PDF's structure and embedded links suggest it is part of a link farm designed to redirect users to potentially malicious websites, masquerading as search results for educational content. The presence of multiple disposable domains and link farms indicates a phishing or malware distribution attempt.

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://druttle.ru/wix?keyword=latitude+and+longitude+worksheets+3rd+grade PDF link annotation
    • http://bomezifubaf.iblogger.org/39780614449.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/LhckPQj/hd_wallpapers_1080p_for_pc_pubg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_60251c9360637.pdfIn PDF document text
    • http://micrometerdigital.xyz/28288712785omafs.pdfIn PDF document text
    • http://fobobexezonajil.iblogger.org/42838506003.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/hgjehcG/fishdom_game_hacks.pdfIn PDF document text
    • http://sun-italy.space/dragon_ball_z_comic_book_pagesd4wsw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_600e5a7edba5b.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/e2f15c707fc2ed.pdfIn PDF document text
    • http://grafoanaliz.ru/chapter_11_cell_communication_chapter_review_answerst40ju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419642/normal_5fff75e821d4c.pdfIn PDF document text
    • http://academic-club.ru/business_forecasting_wilson_keatingoy65l.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/zaygdKB/netixaxeza.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/gibhjPg/zuwekuge.pdfIn PDF document text
    • https://zufuleruzu.weebly.com/uploads/1/3/1/6/131637307/4675851.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
    • http://fabupumow.epizy.com/89810223414.pdfIn PDF document text
    • http://walefofu.rf.gd/haematology_mcq_with_answers.pdfIn PDF document text
    • http://jozopon.rf.gd/nds_pro_emulator_for_android_apk.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_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 5228 bytes
SHA-256: d323c9fdeaac2615cbe60566d89bcf383e64362685dc2354a389c87f9fd146d6
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10408 bytes
SHA-256: 5a20038bba25324cde23f15ab364e46a99dc53fabc5918dadf8ef7956c9f9f3c
font_02_sfnt_off000110a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71