Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01c7913eedffa45…

MALICIOUS

PDF

69.6 KB Created: 2021-09-21 08:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48b2a3dd9870d75f650f77ff30ee564c SHA-1: 950bfbcb155ed80cdb167a13ec567ab9523ba036 SHA-256: b01c7913eedffa45de859bc9fd77fb962417af99f6e2acc98f6807fcdb6612d4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common screenshot lure, indicated by the 'PDF_IMAGE_LURE' heuristic, to deceive users into interacting with embedded links. The presence of numerous external URIs, many pointing to potentially disposable hosting, suggests a link farm or phishing campaign. ClamAV detection and ML classification further support its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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-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 69 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.
  • 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://awarelaxcentrum.cz/user_files/file/sirijibamevaxafotajepif.pdf
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/papovoratiweref.pdf
    • http://majorpropertygroup.com/userfiles/files/fileneruvi.pdf
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/jovumalov.pdf
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/7900942418.pdf
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/doziguneroxezebebe.pdf
    • http://artdealer.vn/upload/fckimagesfile/1e01ee18a8ecb7bfc4013597b14d1261.pdf
    • http://samuiluxurytravel.com/Uploads/file/mobukezekinudusasozubeta.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/3219850141.pdf
    • http://space-edge.com/upload/files/28766614719.pdf
    • http://akcjonariusz.com/UserFiles/file/30108938000.pdf
    • https://unitedfightalliance.com/ckfinder/userfiles/files/mebemotiw.pdf
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/fujef.pdf
    • https://drjou-vc.com/upload/files/86626950347.pdf
    • http://theprofitnesstrainers.com/userfiles/file/tepefufumoridem.pdf
    • https://alajuusa.ee/media/contents/file/bujopodiju.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/30142079395.pdf
    • https://solener.info/ckfinder/userfiles/files/bosuwomisoxafikakudiro.pdf
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904190210842675.pdf
    • http://waycreon.net/bhaskar/yii/upload/files/nudosuxofufijofu.pdf
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/31240150458.pdf
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/lubiferufi.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/nasexiv.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9779a8570---24693105678.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=videoder+apk+download+2019+free+download+for+android
    • https://www.thc.gda.pl/ckfinder/userfiles/files/27678936138.pdf
    • 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_off0000b41a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB41A 16792 bytes
font_01_sfnt_off0000cc2c.bin
f588a30e477428e5308a489fbb14ad4328204c17ea21ecb5dca9b7ad41e119c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 14060 bytes
font_02_sfnt_off0000ef28.bin
a9520b326d85c826c760d9cc54c7dfc77bde369c7d64c682a49893e6dcfedcb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 10832 bytes