Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f28bd0e74a6bf4e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-21 10:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 857a4fcd009ae4681cf3a63a8becf61a SHA-1: b38d8e1f0e011956aaaf2956061659816614bc8c SHA-256: 8f28bd0e74a6bf4e9f27065c89d66c8f68c36001f2da01772229ae965798e7cd
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content, despite being heavily obfuscated, point towards an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://smartdeal.pl/files/upload/files/97731721809.pdf In PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/nizalad.pdfIn PDF document text
    • https://cmoretv.com/userfiles/99903384574.pdfIn PDF document text
    • https://csodamalom.hu/files/files/41318848265.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/76293468451.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/30169281662.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/5263653184.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/44281645016.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb172b6425---62536679067.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/49669396240.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/koguravasaxis.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905111212_w8ev37.pdfIn PDF document text
    • https://sharenkon.com/files/14444032546.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/lemowim.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/18396704318.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/wojax.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/70696818409.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/31730015554.pdfIn PDF document text
    • https://rjpexport.com/files/75065537024.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/99711686251.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109210515590626.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/kakugosusa.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/xalogegojigopa.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/mitovuzedefinowawitizolaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gamegem+android+apkPDF 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_off0000b5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC1 10556 bytes
SHA-256: f06870ff351b6b6c6f3d56a6d2a87ee077ef49f3aaa35e405b92e22cd792838c
font_02_sfnt_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 17012 bytes
SHA-256: b8d3a05072907a9f0cb3988d724a7c0acbfb1aee246439356b5d65400038495a

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