Malicious PDF — malware analysis report

Static analysis result for SHA-256 941317d072709e02…

MALICIOUS

PDF

394.2 KB Created: 2021-12-27 14:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 04500a22194a22225fa5dbf65f820a27 SHA-1: 939ea966c738c7cc7786badbff4e898a3b4f83b0 SHA-256: 941317d072709e02fe19dedd7766d244115a69123c6f27189d051aaa6d41dd6a
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high-confidence ML classifier flagged it as malicious, consistent with ClamAV's detection of Pdf.Phishing.Trojan. The embedded URI and heuristic firings indicate a phishing lure, specifically an image lure linking to an SEO redirector for a fake download. The primary IOC is the redirector URL, which likely leads to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6297

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=ecology+study+guide+worksheet+answers PDF link annotation
    • http://igabana.com/upfolder/e/files/20211005062640.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/68952118142.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/wozoritosotifijitemabesub.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/talowajudijinabogofij.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/v3fd1ajd6om5l4h9sd4v07onhi/2606363932.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202112041927215528.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/2846373649.pdfIn PDF document text
    • https://www.massola.com/assets/themes/sbadmin2/ckeditor/kcfinder/upload/files/wipuxitavezileweg.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/42343727344.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/bebizeduraguvogumojoxu.pdfIn PDF document text
    • https://hiroyoung.com/data/files/16317662681.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/wamogaputizijuzabaxixipag.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/64819618600.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/pirojofupavajuduxezepozak.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/voxufiwip.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/vonujoko.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/kegivukavom.pdfIn PDF document text
    • https://norservis.com/files/files/pobamejuxofumu.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/dobajit.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/zurev.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a512f86ab2a5c69cd0e4a495e067f29d/87102710341.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/16835153391.pdfIn PDF document text
    • http://julianina.de/upload/file/71602240261.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/dogikowowodupi.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/83384099176.pdfIn PDF document text
    • http://mentoslaci.hu/admin/kcfinder/upload/files/nukopana.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/50529543834.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/72813752037.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_off0005b9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9E9 16416 bytes
SHA-256: cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336
font_01_sfnt_off0005d08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D08D 11024 bytes
SHA-256: 03b88147dbd6b78c52c45665070e19b3431894ead6466c3efa0cb32816912a7d
font_02_sfnt_off0005ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA00 18444 bytes
SHA-256: 431bc436daffe6993efe5d85516d8081013d9e61dc8385420c24ca394acf81d7