Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ac80ac7804d38d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 07:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad9fdaeb383f5ba55ac7d466d556eee3 SHA-1: de1fea834a5be91e4fb689b035a12d230f2a3e67 SHA-256: d7ac80ac7804d38d002a1158f8b6cf6b2dfacdad122ab71ac49a7e9514258e46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' directly supports this assessment, indicating the document's purpose is to host a large number of links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=the+divine+blueprint+freddy+silva+pdf PDF link annotation
    • http://gainliving.com/upload/editor/file/jewumadunaw.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/83109793384.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/71647478013.pdfIn PDF document text
    • http://bastola.org/userfiles/file/vadoxowixalimagidit.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/56fe712c195c9e17ab96041c704c92f0/rajuredijip.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210917_011207.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/9826995651.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/zedir.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/60305998847.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/vawitawutitibofozigopixe.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/92120858861344c64a40ba.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/4664869855.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/tigufevemikitosede.pdfIn PDF document text
    • http://reflita.lt/uploads/files/witep.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/zefuwesowadifapepigugejok.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/rozakebitajoduxodegulebam.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/58059692203.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/47452301764.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/zokesurebewuwidazukugi.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/3471377954.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_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 10856 bytes
SHA-256: 4d8ea34e48d199ff832c09c96b293add57208fb1e0f6998ccb9ce6d3889a981c
font_01_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 17008 bytes
SHA-256: af6a45593adfe4a97fe4b77dfc957dca66f6f815ed85f1c0a2332b00e1743122

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