Malicious PDF — malware analysis report

Static analysis result for SHA-256 8758c35c1bbd1603…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 12:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 894478d3013a12f05def13412bda5266 SHA-1: a9480c7412af7184f3d02cdeb270c5ecfd07ad71 SHA-256: 8758c35c1bbd1603a21b4b24420a0194e8f023e84a96a440012c1160896eb0f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button lure further supports this, suggesting the document aims to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=apk+for+all+app PDF link annotation
    • https://sanmuabandoanhnghiep.org/images/content/files/85914224926.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/50805767400.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/29102251008.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/xozogemefilifobi.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/43707641372.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/falipabugutimebavom.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/89932415454.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/11761730998.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/xipenokupafepikom.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/kuwajo.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/bugilizufukumipanalor.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/somubitofudiwuruneze.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/futesopav.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/kamoluba.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/85890999292.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/98946321567.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cc649924a---fajakodevelapideji.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/sirewadororew.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/nelekamifog.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/kawudelikewotazaposoto.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/60075040312.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_off0000c091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC091 9832 bytes
SHA-256: a2d631c8be7afc6772d8492666cff0962687ab4cb78802e35d70a3233c2ba29d
font_01_sfnt_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 17568 bytes
SHA-256: 66c97962efe8e187970d05a7e1ab7b26108593da98b900cc0f0a1bbfa17b9444
font_02_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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