Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9d274169650b88…

MALICIOUS

PDF

79.0 KB Created: 2021-05-29 05:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9fec670022ff444a8ac92e3f1a79b73e SHA-1: 94990c8524de33bb61d0e424b914f03e43a0cd37 SHA-256: 7b9d274169650b885835fb0770df1e365aca2409da7800493e95dbee549fc51f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to a suspicious domain that appears to be part of a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

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://vilenefex.ru/strik?utm_term=what+are+the+advantages+and+disadvantages+of+experimental+design PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487625/normal_605888774a50f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_604f76ee54ded.pdfIn PDF document text
    • https://tuzuratodaf.weebly.com/uploads/1/3/0/7/130738639/2ec009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479707/normal_6030835ed0706.pdfIn PDF document text
    • https://gazonigupeti.weebly.com/uploads/1/3/4/8/134879892/4fa8078490fa69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414498/normal_6050638a7dd0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_6031d0509a349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_604982eaac45d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461234/normal_5fdbe700cd7c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_601b667960b4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_60320baac7c0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417213/normal_60605255eaf9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/58324fbb-eed1-4a7a-afbc-a958f9129293/nafikaxopikajepep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883dc288-309c-4073-8b79-7435913a4099/64056138154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde952fc-811c-4b1a-a129-dc5ce34d7a23/libros_de_ginecologia_y_obstetricia_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0aba543-ea63-4426-8541-cdeadc5d7108/finish_line_coupons_july_2015_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d27e9806-6fea-4e48-ba81-098ae5576133/duxipurodikonobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9532935b-c8db-4455-948e-39ae94b24a44/tomivemul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c92317-7576-4fb3-a3c1-01800950cf75/cyberpunk_2077_update_1.07_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7490957-113f-4991-800a-049607a01a7d/star_trek_discovery_season_1_episode_6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 5384 bytes
SHA-256: 8ca85becc68f86034f1693ae3266d7d41c8312ce1cc80c790dd3c61e609cdb12
font_01_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 10104 bytes
SHA-256: 197390758aac075d0fe2cf0bccbb9da533422711b9d789404fd5c10a0160192a
font_02_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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