Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acbaf9331b74864…

MALICIOUS

PDF

76.8 KB Created: 2021-02-26 03:06:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3a71da7e36f2d94ab84c5a593df48be7 SHA-1: 5ee930769fa7b30a1d86ad42286d59ba7a88dfbe SHA-256: 5acbaf9331b74864e0682acc943ae6c2edca5c425595c490e2ed03a1a6c17a37
126 Risk Score

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 trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to reference product details, likely as a lure to encourage clicks on the malicious links.

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://maypoin.ru/123?utm_term=m-audio+keystation+49+mk3+49-key+midi+keyboard+controller+%252B+software PDF link annotation
    • https://cdn.sqhk.co/kopilixa/i2rHw5P/universe_sandbox_like_games_online.pdfIn PDF document text
    • http://lodujenoxo.iblogger.org/64944951588.pdfIn PDF document text
    • http://kaxidabifibag.iblogger.org/mathematics_for_economists_hoy.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/niv_bible_gateway.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/59144375101.pdfIn PDF document text
    • http://teaapple.space/67049181969zhanw.pdfIn PDF document text
    • http://firstreadersclub.com/figure_of_speech_irony_worksheets1vcck.pdfIn PDF document text
    • http://teksalle.xyz/172410997073i30w.pdfIn PDF document text
    • http://damisidem.22web.org/why_does_my_wireless_charger_turn_red.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/SUiiogd/mupoluwegefemufogugowebur.pdfIn PDF document text
    • http://eu-study.ru/nasb_life_application_study_bible_indexedmqixq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fafaxuz.epizy.com/delobexak.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/dogezegutimilarixamewipo.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/all_animorphs_books_in_order.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/wireless_n_repeater_wps_connect.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_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 6012 bytes
SHA-256: dc86dfbad3a1654064a650f5356b45ce28b07d5211e1cbb48832584cabbc093c
font_01_sfnt_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 10052 bytes
SHA-256: 00f1b922090e325055043a5fc4252742b9f0931d24b814eaca42d60e802839a8

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