Malicious PDF — malware analysis report

Static analysis result for SHA-256 8066987a50df8525…

MALICIOUS

PDF

66.9 KB Created: 2021-02-05 12:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: db04cb944a17813e272cd9c06edfa976 SHA-1: 1e94e7cd103ef09aa4892bcf5b4a14827a5a79c2 SHA-256: 8066987a50df85256df49f5ea93fbd65bf2057cee366f7c6546c780242365c57
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm designed to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, appears to reference a 'French-english picture dictionary pdf format', which is likely a lure to entice users to click on the embedded URLs.

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://seumenha.ru/wb?keyword=french-%20english%20picture%20dictionary%20pdf%20format PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393890/normal_5fe02770b4ad7.pdfIn PDF document text
    • https://cdn.sqhk.co/dojatejij/QNqjh9j/42475675628.pdfIn PDF document text
    • https://cdn.sqhk.co/nalomuxe/Ud11Dib/19634238620.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/azhgias/men_s_skin_color_names.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/hdLOdeH/divanoluwoxefoteputozar.pdfIn PDF document text
    • https://cdn.sqhk.co/vimanagadu/WhafhcO/pokibanu.pdfIn PDF document text
    • http://thiswaytovogue.com/53398242653w975b.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/ifjgnif/cruise_companies_australia_asx.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/12be380a1ddaee3.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/hisgijg/bang_bang_song_lyrics_ariana_grande.pdfIn PDF document text
    • https://rifivubego.weebly.com/uploads/1/3/1/4/131407021/a3c44cc2b61c04b.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/icLggyd/vipertek_flashlight_taser_wiring_diagram.pdfIn PDF document text
    • http://normaa-id.com/gupavdj77w.pdfIn PDF document text
    • http://epipog.com/itls_provider_manualk2z41.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/bdHRjc2/luximukisakezitoka.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/fibNifR/true_football_2_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61D 5656 bytes
SHA-256: c1a029459b5aaf958469b71af729deadf64cc382499d9aa223148979d5c726d4
font_01_sfnt_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 11172 bytes
SHA-256: 9d2d6f453356e16ded0f1697c80a45a64bdab88d91ffb213e07d1935fc49b45a

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