Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d936fbe9d85b620…

MALICIOUS

PDF

92.1 KB Created: 2021-04-08 08:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 860e2394f82cd248eabb7077623283ef SHA-1: 92a7faafc949502a1d96c340c5dc75e5b8a08cbf SHA-256: 4d936fbe9d85b620ec45371d7708423d9a19cb801d9ed56cf9fe53e61d68d0b8
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains multiple heuristics indicating an advance-fee scam and brand-impersonation credential phishing lure. It includes numerous external links, with one pointing to a redirector likely used for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gimisezijumini.weebly.com/uploads/1/3/1/4/131453276/6772284.pdf.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://jacksth.ru/strik?utm_term=what+to+say+in+a+senior+night+speech PDF link annotation
    • https://cdn.sqhk.co/pawekenu/jeAVji5/long_horror_stories_to_read_online.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/jaiajaK/gidevevakunamugami.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/EhhaYhd/69745579039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_600f2e4d360ec.pdfIn PDF document text
    • https://gimisezijumini.weebly.com/uploads/1/3/1/4/131453276/6772284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465255/normal_6001d97a6dc56.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/kigoxivudut_letedi_bosobol.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/gelawiweza/what_is_a_network_in_computer_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b86649f-2749-4413-b372-8c813ae74a8e/xefawerufamaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32c0ac25-4c1b-4b40-9d3b-87422da90385/science_trivia_questions_and_answers_for_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/what_does_a_narrative_paragraph.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/when_i_was_puerto_rican_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837f6f2a-2867-4cd1-afcb-bc3c0c852275/69179071812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda24908-a2a4-453f-b296-8bfdfca4727c/zojekabebo.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/21682223625.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/how_to_enable_call_forwarding_on_iphone_8.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/96941738176.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/vunuvimapopotevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c742a1-b0b3-4cd2-b8b3-1f1241dfce47/wuxusunadatodezuzodelisi.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/17687459541.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_off00012afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFE 5280 bytes
SHA-256: 2184485df48852450e826fefeb7e31d533dee8b6e939f904343ecbf19dcbc725
font_01_sfnt_off00013d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D05 11196 bytes
SHA-256: 432337b1c7b9f6a48579a915a79da37fb9b6635ea829ffe33ccbee7cd681c246

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