Malicious PDF — malware analysis report

Static analysis result for SHA-256 5422498013186ae8…

MALICIOUS

PDF

90.6 KB Created: 2021-09-08 21:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0eb63e595365c59454e92ce43c1005c3 SHA-1: 8935c99b8564c3522659b3bd63f753b062e11d39 SHA-256: 5422498013186ae89c5fce67051ad07f2b57b7f67675f87bc706d95db7c4aa55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or spam distribution. No scripts were extracted, and the document body was unreadable, but the overall structure and URL distribution suggest a campaign to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://logo4you.dk/userfiles/file/93492114599.pdf In PDF document text
    • http://astprom.ru/sites/default/files/file/zemubovaka.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/70009088353.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/67747682328.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/xuviruxosofit.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/30676943422.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/11036780958.pdfIn PDF document text
    • https://service-panev.com/userfiles/50189661059.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/80ac8d99018032e71632484e62fb6e17/letolesopusunoz.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/8816295114.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60e969f44---mepafufujadalumazokukito.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/80409234187.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/kebonub.pdfIn PDF document text
    • http://netflor.pl/upload/File/bujogixuzozikupalageli.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/xufiwosexokodefu.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/xagavuvurajewavag.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/ranesitopuxawifatid.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/66602352011.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/rubunotatomusapanozako.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/bureri.pdfIn PDF document text
    • http://charivne.info/images/file/jetuvonuxinewedojofugo.pdfIn PDF document text
    • https://actor-conseil.com/files/file/zutawodubot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=world+of+big+countryPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/faxebekukedumeri.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_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 16948 bytes
SHA-256: 5aa887e8cdf7da961ec5918d83099807d1a0b5e303611a1ca0daa8c8feeca3a4
font_01_sfnt_off00012d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 10536 bytes
SHA-256: f512960ee83188ea2bfb5c1e8cb55c5c9b7cf5e0ae16c113a5f40027661c8913
font_02_sfnt_off000144fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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