Malicious PDF — malware analysis report

Static analysis result for SHA-256 b545e126d18a902b…

MALICIOUS

PDF

73.9 KB Created: 2021-02-25 17:55:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ba7bd1299f1f873292f1a88b67d0753c SHA-1: 55e449af1103730f0a85870da50b3e8782f1f0fe SHA-256: b545e126d18a902be7985f6b469c081f6aa556f827229c771fc23820da716105
126 Risk Score

Malware Insights

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

The file is a PDF document that contains embedded URLs, one of which is identified as a potential lure for a worksheet with answers. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest this PDF is part of a link farm designed to distribute malicious content or phish for information.

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://baarspo.ru/wix?keyword=chemistry+molarity+practice+worksheet+answers PDF link annotation
    • https://dewebunofimob.weebly.com/uploads/1/3/3/9/133986907/5b76fca.pdfIn PDF document text
    • http://scarcebook.com/10848398793q91o4.pdfIn PDF document text
    • http://prosucre.pro/aflatoon_songs._pk_freekpyuy.pdfIn PDF document text
    • https://teviwodujote.weebly.com/uploads/1/3/1/4/131453741/suvoto.pdfIn PDF document text
    • http://1xbet-registrat.site/what_were_the_three_estates_of_french_society_before_17893cipq.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/3533612.pdfIn PDF document text
    • http://triple-doska1.club/pocket_mortys_morty_games_guidekw3pw.pdfIn PDF document text
    • http://universityru.fun/icy_veins_fury_warrior_pvp_guidedbwgo.pdfIn PDF document text
    • https://wevumofanefaso.weebly.com/uploads/1/3/5/9/135964816/4775392.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/kenneth_cole_reaction_analog_digital_watch_manual.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/94514825999.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/26374692238.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vololotiwu.rf.gd/what_is_the_relationship_between_art_and_commerce.pdfIn PDF document text
    • http://sasebuza.epizy.com/backtracking_the_human_condition_summary.pdfIn PDF document text
    • http://nanixalo.rf.gd/what_type_of_coolant_for_2014_ford_focus.pdfIn PDF document text
    • http://koxogulu.rf.gd/jenn-air_electric_range_troubleshooting.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_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 5336 bytes
SHA-256: f9ea359d90cc433e99207fa13225463e6b11244d73db65b7de79f6b121493bfd
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 9816 bytes
SHA-256: 1177912ef0bfd62e5b3c5eecbab8e38dd0945be3c1a54f4ffcb3739f57597995

Open this report in the interactive analyzer, or submit your own file for analysis.