Malicious PDF — malware analysis report

Static analysis result for SHA-256 374b3ea494cd3bfb…

MALICIOUS

PDF

71.5 KB Created: 2021-09-20 11:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac92cce52bf280f87b2e4880d0e5627e SHA-1: ec62bb24209fb7c97e1a608aeeff308d7bb43633 SHA-256: 374b3ea494cd3bfba6358052b2dddaa45b002b22fb2b9121955086d1a31820c6
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The PDF_URI heuristic points to a URL that appears to be a redirector with UTM parameters, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=triple+sim+smartphone+in+bangladesh PDF link annotation
    • http://ejmk.com/ej/upload/files/53678261003.pdfIn PDF document text
    • https://mkontroll.hu/File/lezaxim.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gisaxelobotizurevanaraxi.pdfIn PDF document text
    • https://ibericadearmerias.com/file/nasoxopexibe.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/89623938601.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/47957237463.pdfIn PDF document text
    • https://lordoptika.hu/files/files/91726625104.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/fisebevijope.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/24038671135.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/gajuxu.pdfIn PDF document text
    • https://slide-bearing.com/d/files/fazixudo.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/ravodupopari.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210909_9599CDA919EE1B50.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/7797576817.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/fevebisuzoboposogonajafoz.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/43353306457.pdfIn PDF document text
    • http://hoachattn.com/image/files/68912775593.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/juseko.pdfIn PDF document text
    • http://farashimirooz.com/files/56499003343.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613495940fd7d---kugetan.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2e9ff41f4---gomon.pdfIn PDF document text
    • http://moneymaker-gold.de/files/67080161338.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/64329439767.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/39446235344.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_off0000b4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B1 10944 bytes
SHA-256: be05df5c7928e6dd4702f00fce3ff2e749b3ed3a3220194770a9fee8ea2ba13f
font_01_sfnt_off0000cd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 16632 bytes
SHA-256: 8a780d5fbb919ec2717fa582fe8ff52364a6a2bb83d715585c79c28b2ed46ff3

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