Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7847048f775a5e2…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 09:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b91a831bc70a802faafe48d223c71b9d SHA-1: 5987ae5e6a407051f11e340d7b2858494097dc6b SHA-256: d7847048f775a5e27fddd9a5705baea934652da3eb51dcf7014698230e785114
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external links, many pointing to potentially disposable domains, further supports a phishing or malicious redirection attack pattern. The embedded JavaScript likely serves to initiate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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 http://bankerz.in/qpic/files/32634102550.pdf In PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/bedarutuwiriniwezutadal.pdfIn PDF document text
    • http://bamor.org/userfiles/file/vorawivis.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/88997911882.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/17062908162.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lijofudekalagi.pdfIn PDF document text
    • http://maihome.hu/admin1/file/wolejanelip.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/xuwipumasirifazib.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/sewetepuwekidakezedesu.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/79978162031.pdfIn PDF document text
    • http://castel.lu/userfiles/files/74779115791.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/60810712954.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/zegozobatogatawonesufas.pdfIn PDF document text
    • https://vleek.com/uploads/files/62172283503.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/7236465591.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/zigifevu.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/74429820975.pdfIn PDF document text
    • http://www.andreapondika.cz/file/tupewelirarepifizij.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210912_333629F40BC1194D.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/80854632932.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3890af1b2---52737162469.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/46848462635.pdfIn PDF document text
    • http://yejida.com/userfiles/file/23720421889.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/mujubemakomilaxizunemuk.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sksp1mfmepsm9fc2m5idfatusu/1647684754.pdfIn PDF document text
    • http://zamgph.com/uploads/file/051232392894.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/feradanumuguxodonekosevo.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/47931820639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=unnecessary+apps+on+android+phonePDF link annotation
    • 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_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 17844 bytes
SHA-256: 1fa798762f815e8ae8005903cd34c9b65afce7fcddc8bd7019245ce74881a459
font_01_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 10588 bytes
SHA-256: cd07d0b0c975b8d6b52f40f7bdb840a28c7c4130d4620ebf73b91aa36848ebe9
font_02_sfnt_off0001388f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1