Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a7d5f74bbd4af2…

MALICIOUS

PDF

74.1 KB Created: 2021-09-13 07:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ab7382d1012abf4a9b3d81437780bcf SHA-1: 84edfe2581c35675c92fd1e8d415bb230fd5d74d SHA-256: 70a7d5f74bbd4af2f95768eada80e7a535f141a0372e6e50ab2979d99c30738e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thinhhoanggia.vn/Images_upload/files/8165127068.pdf In PDF document text
    • https://gencerenerji.com/resimler/files/12981503712.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/95115504407.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/61834871343.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/69547944063.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/lurakizapefujerodan.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/gejibimubojirikub.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/82559353819.pdfIn PDF document text
    • https://angem.fr/userfiles/file/kuxakewodanopinazetuje.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/73082019610.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/95828144507.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/judixed.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613952ba086d6---xilamijej.pdfIn PDF document text
    • http://blccy.com/userfiles/files/72642544078.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/pijamedizo.pdfIn PDF document text
    • http://contua.org/userfiles/file/kisewivijopevelagedaxa.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/20096783420.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/74442440138.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/manolugij.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-11/2109112249468643071ozxppfmo1oo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/279404b210f5a2852b978b1834aa2076/46973685589.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/liwozibuwibe.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/23631321438.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/nuxutiwipegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=liv+and+maddie+putlockerPDF 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_off0000bbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB1 17984 bytes
SHA-256: 1c79e432f1e38b9f547630bce96ab999b1ea381f0109a06f326a2381fcc787b7
font_01_sfnt_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 10724 bytes
SHA-256: 922106b189f5d899484c1b31b257e92031c3a2082f7cf98322e8269548a19921

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