Malicious PDF — malware analysis report

Static analysis result for SHA-256 86537f58160cf24c…

MALICIOUS

PDF

79.5 KB Created: 2021-03-05 14:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 44c72d4aa00fe4d5b269e4bcdcec7dea SHA-1: 548af40d9c52d02a46613c279e6891ce96270af5 SHA-256: 86537f58160cf24cd7b938b7d3f62161ca7eb5ab56a9294302877f959458dd08
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier also strongly indicate maliciousness, specifically flagging it as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/strik?utm_term=artificial+neural+network+tutorial+in+matlab PDF link annotation
    • http://capridigi.com/analysis_toolpak_mac_excel_2011ax7y7.pdfIn PDF document text
    • http://afracheat6.xyz/foviradajuzerubirilupamubn4s0t.pdfIn PDF document text
    • https://gugozakeku.weebly.com/uploads/1/3/4/5/134588211/xuxano.pdfIn PDF document text
    • http://creditscorefix.info/486634788554yxxm.pdfIn PDF document text
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/f1f45c6c2.pdfIn PDF document text
    • https://xidaxawefitorat.weebly.com/uploads/1/3/5/9/135958331/zowudoviku.pdfIn PDF document text
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/xatejenufofava.pdfIn PDF document text
    • https://detidigem.weebly.com/uploads/1/3/4/4/134491675/buzanefid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wutisigila/belkin_n300_router_software.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/spider_bite_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/93934542144.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/16204969207.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/sofinidunofugepivoneb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/586c7693-2cf9-43c5-b663-9c25ee596871/dell_v313_printer_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/cadsofttools_a_dwg.pdfIn PDF document text
    • http://sasunuvelew.epizy.com/agrianual_2008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98482e01-fbdc-40fa-99b2-23c9758daaee/32159821326.pdfIn PDF document text
    • http://gexepitirunagu.rf.gd/les_miserables_movie_2020_wiki.pdfIn PDF document text
    • http://fizuvofodiku.epizy.com/breville_tea_maker_replacement_carafe.pdfIn PDF document text
    • http://zimogaz.epizy.com/jabalalovegenagoriweruzog.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/79849390171.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/technical_dictionary_english_spanish.pdfIn PDF document text
    • http://zitolejix.rf.gd/12104814714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228ddf87-d126-46b9-8c12-88a0694e2add/38716487971.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_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 5132 bytes
SHA-256: 5925b58a835a5fb50ed53d60fc5dedfff6196431d7ef3b063f9af88bda27e773
font_01_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 11524 bytes
SHA-256: 46ce4f666b1662a39bf33d02b30cdc90f0a5d76334b80eb9fa16bec99aa1acf8

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