Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0eca3823a2da2e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 18:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1af06227727459eb1f9035d9df2ab58c SHA-1: d0733706e69aded8f8bc3be886bd430653a72ab1 SHA-256: cc0eca3823a2da2eff0b651c4ff744e68a0cbc0e0fa98cde1b66bf49875f177b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ketchas.ru/uplcv?utm_term=use+phone+as+graphics+tablet+for+pc PDF link annotation
    • http://drukarnia-skawina.pl/app/webroot/media/files/89212129767.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/19520877682.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nopafafinelolivuninunu.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/rewiwituwederamikuxisimo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dad7b9c78---vadexab.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/timevedizefupukewamupuzi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161307616439d7---nitozutiluvimurekebezik.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/14666059038.pdfIn PDF document text
    • https://fratellifurloni.it/file/liketumuromadovotoxinufox.pdfIn PDF document text
    • http://dytac.hk/userfiles/47103376242.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/77564509791.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/19449798236.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/fewutumezujuvepatezakujet.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/16928104165.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109020125401160.pdfIn PDF document text
    • http://aa-nusd.jp/68450417541.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/32221932154.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/961706534.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/45552178804.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/86456659052.pdfIn PDF document text
    • http://masonhn.com/d/files/mozirolerezixeximidiw.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/taliwidudavatud.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/92148455924.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/zodakujerazuzoforekipigi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 10908 bytes
SHA-256: 70aaf94f9389ca946c15e1703fa0b0ccf93db326a8f959a3a5d3806b773e63b6
font_02_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 16200 bytes
SHA-256: 696b81f0f901cf0c0a856ac71d8514d446dd44cdedb61b5f7084dc6a487815c3

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