Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f7c25366f91f03…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 00:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 103b9afcc12de0379326b3a5b8b8a70b SHA-1: 20367e6a8b9fa8fd7757f70e6e8f2d12e748776a SHA-256: 34f7c25366f91f03a41d10e42b7316f83159b8ae3714df4527954ad8e690b191
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting an attempt to direct users to potentially malicious content or phishing sites. The presence of a large number of distinct hosts and links within a small PDF file, coupled with the use of UTM parameters, indicates a coordinated effort to distribute traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://khangle.vn/uploads/images/files/77284758287.pdf In PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/lusum.pdfIn PDF document text
    • https://mimpidia.com/contents/files/nigowisixadok.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/muriruxonuketodogizizu.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/55396711463.pdfIn PDF document text
    • http://andreevka.topmebli.com/content/xuploadimages/file/kekixowefugip.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/45232465222.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/togakaboku.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/pedusapejomedamezemelazol.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152b407a78e9---54871033142.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/3185172444.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/418079e694e608d7e1ce98bbffd1e9d8/meputubija.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/562159741.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/86765436339.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/waximagiw.pdfIn PDF document text
    • https://brs.jo/userfiles/files/84628874443.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/8795815423.pdfIn PDF document text
    • https://ptogel2.com/contents/files/73264900913.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/15643145768.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/xeludasegofedixidojat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=touch+screen+java+games+320x480+free+downloadPDF 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_off0000ae3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3F 11880 bytes
SHA-256: 6efd9ee181cd2571535d66e707ba65487559434884a1c4e187302f9c5b580f8a
font_01_sfnt_off0000ca9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 16584 bytes
SHA-256: 6742e292ff6d9c41bbdcd5d72be901ac798844aa3f8b7d3373cf3947ef042e08
font_02_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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