Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c50a4061697ac4…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 08:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b20e888deb037b18ef8229d62048888 SHA-1: 2b3e7d95a735811669210d40e23e0355d3b576ec SHA-256: d2c50a4061697ac483e6dfc9813140546e7e54574498cb27fbd7e40ba3e95cce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to external PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a53128d3d5---zatuvowigovajan.pdf In PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/vixevunopovoxa.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/10883412050.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/pevukawisesizitutekedaf.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/53024872739.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/49709881237.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/kisapiladufetamozepol.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/noxur.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/jogogukixujixiwunujunogu.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021092011315975.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/waravinalopajenemazo.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/58230093063.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/2657884823.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/79d5d91aa444b1f0df2cdf36357f6bec/pizomabi.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/13259311064.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/10962943715.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/43518604150.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23271352883.pdfIn PDF document text
    • http://anm-av.de/uploads/files/49513018398.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zelobuvebozafad.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/95564550447.pdfIn PDF document text
    • https://telorgabus.com/contents/files/24495550221.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/84776982700.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/dikogutuvotenid.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/88864461426.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/zoduvekiribo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=book+of+sith+pdfPDF 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_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE73 10196 bytes
SHA-256: 9e9c5264a41deb2c86b354c0b7537bdd49ef4376950b325c58e50aea8da463ea
font_02_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 17908 bytes
SHA-256: b0f92a296d9539437940bb01e6144d24fe4019a338d48a4791f47d7f66154bf5