Malicious PDF — malware analysis report

Static analysis result for SHA-256 1309f9b51549cc0b…

MALICIOUS

PDF

91.2 KB Created: 2021-03-15 14:29:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00999abadfd8f7d4cb5b8515fe2716ac SHA-1: 2d7b66083b648c9caf9be5078c864252cae35e99 SHA-256: 1309f9b51549cc0ba65bf047fdf0e96a45271436b7e7c7e2c7909fc7e4427b4f
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/123?utm_term=application+format+for+society+noc+for+passport
    • http://jukojadijomefar.medianewsonline.com/types_of_crime_in_sociology.pdf
    • https://static.s123-cdn-static.com/uploads/4373998/normal_5fc6977d2a613.pdf
    • https://static.s123-cdn-static.com/uploads/4450864/normal_5fe25ead9e463.pdf
    • https://static.s123-cdn-static.com/uploads/4409610/normal_60049ae8c13c3.pdf
    • http://kojijeku.mygamesonline.org/nkjv_study_bible_large_print_download.pdf
    • http://joteruzawareba.iblogger.org/winter_hidden_pictures_worksheets.pdf
    • http://jinobuzid.scienceontheweb.net/nsfas_application_form_2020_nwu.pdf
    • http://zujejilolo.scienceontheweb.net/shimano_dura_ace_di2_user_manual.pdf
    • http://jalazekesofijot.medianewsonline.com/memujarir.pdf
    • http://xawegap.mywebcommunity.org/smart_watch_manual.pdf
    • http://babitilakibo.mywebcommunity.org/1359753793.pdf
    • http://suwadebizon.mywebcommunity.org/purified_water_specification.pdf
    • http://polobasopika.mywebcommunity.org/82136968425.pdf
    • http://vadosixajobirug.mygamesonline.org/safety_not_guaranteed_ending_quote.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zuleturibalege.rf.gd/yard_machine_snowblower_carburetor_cleaning.pdf
    • http://wutorokanotomav.onlinewebshop.net/zolimej.pdf
    • http://wiwosotu.myartsonline.com/toyota_supply_chain_case_study.pdf
    • http://xobebol.onlinewebshop.net/koxixefopasasimori.pdf
    • http://karudopinu.rf.gd/yamaha_dgx_640_price_new.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001163d.bin
0a0b5c7cbc953ac69a173c97ad4905ce378ac6b2ccdafdfee333237d939c57ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 5040 bytes
font_01_sfnt_off0001273f.bin
c0554e23ba93c46a4ee8a8a3dd65e4705a09feeb3de47e28fbe18e16a26d888d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1273F 11784 bytes
font_02_sfnt_off00014f59.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F59 4324 bytes