Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b91d7a77c1df32…

MALICIOUS

PDF

88.1 KB Created: 2021-09-20 02:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b77be95b3b6cbff3546083e792916f8 SHA-1: 539b1d2434328ab9c4c9b2e601a336524d5a946d SHA-256: 75b91d7a77c1df32584a17adf7c73fe9f79dec65616d0b744698df5b651ce42c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is often used to download and execute further malicious content or redirect users to phishing sites. The numerous external URLs, many hosted on disposable domains, further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 6

  • 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.
  • 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 https://queure.ru/uplcv?utm_term=can+t+play+gif+on+android PDF link annotation
    • https://carparts-fixture.com/file/file/nusikadojejofa.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/93935481347.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091319041373499.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/zobudifirowu.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/8818573315.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/gaziduromexozoxusakiwabu.pdfIn PDF document text
    • http://novafish.it/userfiles/files/wapexiwuzik.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/vurokise.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/nosasat.pdfIn PDF document text
    • http://banquat.com/userfiles/files/totafanesilab.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/48595481814.pdfIn PDF document text
    • http://candientuvibra.com/images/file/79744783278.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/torugisululexomarejiw.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/1447a1fdb828355f9f1b736e75940c1e/52450620183.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/73712147155.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/18718204560.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/viravowaditonu.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/19812151125.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/35008775576.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/rijisuwuvezagireni.pdfIn PDF document text
    • http://rayanchem.com/d/files/dotelamijulerobef.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/16261025600.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/73984847539.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/14975731925.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0kv55sng04mhujdfe546o7r2i0/26512769176.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/93812747905.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013759.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13759 17632 bytes
SHA-256: 28921fa25c0ccd6266af3a288c07cd3cda4ff7580b15adee30e31d827f20c370
font_00_sfnt_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 10516 bytes
SHA-256: d67c8acf2fb7b69f818f4a38feba5798e5b6e311514ed783fcd8f716b259747a
font_01_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 17060 bytes
SHA-256: d01bcb33f6e829f1e1cdbc9b515bb66c49ba911c654d31bbe7e950c937493c11
font_02_sfnt_off00011f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1