Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4c056458416a37…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 15:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b5e7db28b1f32cbce7f93fae57bbfa8 SHA-1: 9ec85216f548037a6997e0c9b02b3251f79ae0d3 SHA-256: 5f4c056458416a373bf8f2ca533d14a63564f5a6efa0c778c2d888771346b1f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are consistent with phishing or malware distribution lures, likely delivered via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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 http://tuzoltosagmihald.hu/userfiles/file/xalimemepazimuto.pdf In PDF document text
    • https://khmernative-rice.com/userfiles/file/60274962678.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161365509b3b27---38966422850.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/8471595444.pdfIn PDF document text
    • https://durimawar.com/contents/files/pumoden.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/20818769789.pdfIn PDF document text
    • http://ledins.lv/cms/file/jitejupotejasuwepowewen.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-9/20210909051812209808.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/funadumokunuginekelafopi.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/19303318936.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/98664632131.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/36823314095.pdfIn PDF document text
    • http://freeorden.com/media/file/12087447640.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/88171767116.pdfIn PDF document text
    • http://banquat.com/userfiles/files/1308338998.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210903020721.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/58717665788.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/58500078811.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/piodeg1src3p0didov8489fij0/75472308690.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/80294329427.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/rajitidiburamag.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/nepex.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/nobegivezowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dinosaur+simulator+games+online+freePDF link annotation
    • 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_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 17172 bytes
SHA-256: 875b0009192345afbbab1d8b1f7189dc82056b11671fdd2cfe154b7087b81c0b
font_02_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 10660 bytes
SHA-256: 86bee34b9de5eba60dc036ba0bd360d00a26a32cd8f5b211f138a7ba2fcf11c2