Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fd4543f2f1cb3c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 05:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b22da3aac8bc2c41b1e790598eaf3b3 SHA-1: 5f1ce70e3738eb3c199261479c1c5f78561cd456 SHA-256: 38fd4543f2f1cb3caec2e76a6425965d6f5352bd14e20a97c47b6eac246b6fa8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, suggests a phishing or malware distribution campaign. The 'utm_term=install+chrome+pop+os' parameter in one URL hints at a lure to install potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=install+chrome+pop+os PDF link annotation
    • https://acconpriti.com/ckfinder/userfiles/files/84195694802.pdfIn PDF document text
    • http://meskerjager.nl/media/files/49492589804.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f466f120e---likefid.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/40097141354.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/kupakogejur.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/lorefodunekuran.pdfIn PDF document text
    • https://0900107678.com/upload/file/navumefimip.pdfIn PDF document text
    • http://bastola.org/userfiles/file/97794658198.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/mavexiberazivepu.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/40574592044.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138da367a80f---futezufux.pdfIn PDF document text
    • http://innotack.com/userfiles/files/45404076951.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/vigetuvufubitanem.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/junugivavasaka.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109010952544189.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210902010845729539yibwsd.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/sipufin.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/131338936161362a8898c22.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/dunen.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/45039188345.pdfIn PDF document text
    • http://honghuibio.com/d/files/34101083107.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/lojamolosaner.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/zowovalodujazunisud.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xiboraguzipipise.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pewevadapiradej.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_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 10496 bytes
SHA-256: 6481f87b96e0ea8417c053a3a3514e0871ffcb693731ce17d3e49d85007a703f
font_02_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 17356 bytes
SHA-256: d59ec4de69d3efd69a76c4695582cba60ca4cf6b63c7bbc4698f9109ca98bee0

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