Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3917ce0094c80c3…

MALICIOUS

PDF

68.3 KB Created: 2021-02-14 09:31:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 85c6e24614b109bb8c98f5c7e67505ba SHA-1: d8b40b471511306c4a93dfbba633cf5f1482c1f3 SHA-256: a3917ce0094c80c344571c3d10ea2957e7012fd05106a7898c570ab06ae8062a
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, characteristic of a link farm, with one URL pointing to a potential phishing or scam site. The PDF structure and embedded links suggest an attempt to direct users to malicious or ad-filled websites, likely as part of a phishing or traffic generation scheme.

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 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://maypoin.ru/123?utm_term=tense+agreement+quiz PDF link annotation
    • https://cdn.sqhk.co/kaxonavi/i9gjjde/14752114058.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/jwjjhju/timudebefakekesukemara.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/OpC3gi7/xiluxeratudobimapusov.pdfIn PDF document text
    • https://cdn.sqhk.co/wizevomorofe/wiehdwe/survivor_island_of_the_idols_cast_voted_off.pdfIn PDF document text
    • http://xatubaxo.iblogger.org/cof_ic_full_form.pdfIn PDF document text
    • http://puwonasomoso.22web.org/67203248204.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/2762136.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/nRibhe7/polorenigerijek.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/CLcjird/yellow_jacket_wasp_scientific_name.pdfIn PDF document text
    • https://wapixanap.weebly.com/uploads/1/3/1/1/131164574/nofedijafari.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/devuxuzejozam/fonepenedizez.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/isotopes_and_isobars.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/94185879254.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/alphabet_practice_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/rijafi.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/comparative_form_of_short_adjectives_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/83395599961.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/teaching_english_family_worksheet.pdfIn PDF document text
    • http://kojavigetizafi.epizy.com/birthday_song_status_video_mp4.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_off0000cebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBF 5096 bytes
SHA-256: ac0d11d51e744e58c6d4b13e1aef93c8d660db2bee5f327ae4928e05abf2aec6
font_01_sfnt_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 10760 bytes
SHA-256: 19c9559f11d6bc5f060d10e5f010a92f0b0895f62d6d131d50b775ec4eb7b7c3

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