Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8f6b655ab8f79d…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 23:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32e8fc9d78a31b83dce1f6ae3d1f3ed8 SHA-1: 7bcc942a8a1376a7859503db4bc4521bf35727b5 SHA-256: 8c8f6b655ab8f79d9bc5099151e187ad1b3089ca6fb00e1606ea6b5a62124eca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and is structured as an image-only document with an action trigger, typical of a phishing lure. The document body is heavily obfuscated, but the presence of embedded JavaScript and numerous external URLs suggests an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/2ethcdp5gv5rci0caogv7stvgb/wakegid.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/41807961224.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d461239cf---27461037070.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/65571690241.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-9-14/20210914101155421120.pdf
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/lokozukamuf.pdf
    • https://j26clean.com/upload/files/ronizefowumesom.pdf
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/zobagi.pdf
    • http://huthamcauquanggiap.com/upload/files/96058936917.pdf
    • http://mayepnuocmia.vn/data/ckfinder/files/pagudevuxugimufisizeg.pdf
    • http://westhollywood.ilovepokebar.com/uploads/files/vipepumo.pdf
    • http://factorycontrolprojects.com/userfiles/file/24698562841.pdf
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/kidobelever.pdf
    • https://halead.com/uploadfile/1630770536.pdf
    • http://china-baby-clothes.com/d/files/78950282544.pdf
    • http://zussobrance.sk/grafika/dokumenty/tofuzuvurul.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/gukipifatuluwu.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/muruvewiteluferu.pdf
    • http://telegid.tv/userfiles/file/43138130001.pdf
    • http://vibrator4you.cz/UserFiles/File/boximifijudo.pdf
    • http://cerritos.songhakbbq.com/uploads/files/vizozonunukimamenib.pdf
    • http://chaukitchen.com/uploads/files/ritowelinojakarezug.pdf
    • https://oreopay58.com/ckfinder/userfiles/files/10810929980.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=offline+tv+app+for+android+in+india
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ade3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADE3 16792 bytes
font_01_sfnt_off0000c5f5.bin
c9e383229c067c0ee7f0a6b96a15f3df646de347d10bc409bdcacf969c0b82a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F5 14284 bytes
font_02_sfnt_off0000e9c4.bin
1d803bbd2e7a6c3b550c217afc935a11d083cef86a6b87944e4a87bcc7942d5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 10412 bytes

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