Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb1fc7210f92865…

MALICIOUS

PDF

125.2 KB Created: 2021-03-09 15:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9d6ecee3c5629ca37714e4cc958ed17d SHA-1: e90c83ab2102bd7f525f2981f6634cc447fac485 SHA-256: dfb1fc7210f92865e7773f7cec246711b025020f8a2d7693a36e03cdd493fca6
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to facilitate further malicious activity, likely through user interaction with the links.

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://resalured.ru/award?keyword=rda+cataloging+rules+pdf PDF link annotation
    • https://cdn.sqhk.co/difixoruze/hj8jjIH/90263598566.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/how_to_self_clean_bissell_crosswave_cordless_max.pdfIn PDF document text
    • http://kazexezawulozij.mypressonline.com/cuantos_metros_cuadrados_es_un_metro.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/black_and_decker_cordless_drill_combo_kit_with_case.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/how_to_use_a_dishwasher_frigidaire.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/zerumizinobozipi.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/positive_behaviour_support_strategies_for_toddlers.pdfIn PDF document text
    • https://jalusuduzewot.weebly.com/uploads/1/3/1/4/131456012/5404191.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/SqPMibq/dujok.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/rjihgeO/black_rifle_coffee_owner_net_worth.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/2558855.pdfIn PDF document text
    • https://cdn.sqhk.co/titukopano/fmgflhc/kojuvuwunibemefa.pdfIn PDF document text
    • https://tewazaxapij.weebly.com/uploads/1/3/4/8/134873756/85e109ee1f3cf2.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/texeleri.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/polotuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livirava.atwebpages.com/tanikedazogu.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/mugidapizagiluwatekub.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/3342506702.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/4_column_accounting_paper_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/13022636460.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/christmas_songs_telugu_2019.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_off0001addd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADDD 5328 bytes
SHA-256: 384e251bb92b5196e8867cc4f0dbc1d4302cc94da73b1db3938e9343d4e31208
font_01_sfnt_off0001c013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C013 11736 bytes
SHA-256: 8412c540d2dc090b860ef5438e9a219469b156ec9cea1b1ae2cc751de89f1e17

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