Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40dd855bd5a7b55…

MALICIOUS

PDF

81.4 KB Created: 2021-04-11 06:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a1360866e7a2a3b4b7d021be9cd9c09 SHA-1: d3bbe7f3ad65fd3dc4c272d2b31529a3c250c6a3 SHA-256: d40dd855bd5a7b55cb7b8397071e4ace69c2e409a916376367850552a4de6fcf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://soxebez.ru/strik?utm_term=how+to+calculate+prevailing+wage', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=how+to+calculate+prevailing+wage
    • https://zunijitulizi.weebly.com/uploads/1/3/5/3/135305500/3087748.pdf
    • https://cdn.sqhk.co/lijusute/jdhdjbG/zabezelugawuxigaxiz.pdf
    • http://legionmone.xyz/letter_format_for_students_in_pakistankks1f.pdf
    • http://discovljzg.fun/world_war_z_game_ps4_co_op7bfaz.pdf
    • https://static.s123-cdn-static.com/uploads/4492286/normal_5ffc00ca23aa6.pdf
    • https://cdn.sqhk.co/sevigexew/jhnhiib/vugusune.pdf
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/1ecd2ac2f1d.pdf
    • https://cdn.sqhk.co/lolumebitana/e98ieij/tafoju.pdf
    • https://cdn-cms.f-static.net/uploads/4369150/normal_603019e911aad.pdf
    • https://bajumavo.weebly.com/uploads/1/3/4/4/134486103/12afb4d595d3c24.pdf
    • https://cdn.sqhk.co/bubiwalifeda/aGic39I/bollywood_box_office_class_of_83.pdf
    • https://cdn-cms.f-static.net/uploads/4444386/normal_606e370ad5f7d.pdf
    • https://rikekipodoze.weebly.com/uploads/1/3/0/7/130776447/fb305774b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fopalew/nijovujizokogi.pdf
    • https://s3.amazonaws.com/jeworurowam/android_9_samsung_s6.pdf
    • http://fivupibutori.rf.gd/zilumelogewatit.pdf
    • https://s3.amazonaws.com/bajapovogam/11708212849.pdf
    • http://wavopomop.rf.gd/xivapilaxa.pdf
    • https://s3.amazonaws.com/suxugipipolazog/15734144275.pdf
    • http://xifenarubomes.rf.gd/hallelujah_cohen_emerson.pdf
    • http://bubexasimu.epizy.com/89664650692.pdf
    • http://kasamikapumumo.epizy.com/bottom_navigation_bar_for_android_app.pdf
    • https://s3.amazonaws.com/kelukakeb/green_mile_soundtrack.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101db.bin
f285cd72fd61608d21e2af6cdff751f022581d9ae08f35dc633ef3fe954e74ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 5036 bytes
font_01_sfnt_off0001132c.bin
b38ec48021292dbee266e0fcd51d2ab1ef3c069410431c74f11d9414d8379525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 10732 bytes

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