Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cca16387ac893b8…

MALICIOUS

PDF

76.4 KB Created: 2021-09-22 23:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: edb63fdddafbe77a710975397268e4fa SHA-1: df1c85cb9fa6b3533fb16f1a6916f2a71bbb51e4 SHA-256: 8cca16387ac893b848d643dd9c57a46a1fe2f201f522d182c39150c0a3864bf2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable hosting and utilize UTM parameters, indicating a likely phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to various malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=how+can+i+increase+the+volume+on+my+tablet PDF link annotation
    • http://medtravel.pro/images/hand_uploaded/files/33632937998.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/zakak.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/tedes.pdfIn PDF document text
    • http://fourfoods.com/images/files/17788303755.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/redulozekilalutudogokitiz.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/korafigave.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/72412452822.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/kuxamojagolu.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/66724777362.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/48232329892.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/vijazegibozegenamazepel.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/ronin.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/84447914241.pdfIn PDF document text
    • https://avukatwebsitesi.cicasoft.com/upload/files/38767235308.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddd69be33d---45758337139.pdfIn PDF document text
    • https://ms2oke.com/contents/files/rikosavodonefovujolorafix.pdfIn PDF document text
    • http://toroisg.com/public/images/files/72552293754.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/guzawuzo.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/85666448345.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/38665474492.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/poluj.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d01ad5389---dadirilubusubonebanuwin.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/lefizibot.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/robedapukojujikofefij.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_off0000c118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 18980 bytes
SHA-256: 9697d00be122dfa43b5dfd166c1e7bbcc36d1821e672bee88303e7053363210e
font_02_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 10992 bytes
SHA-256: 53a77ce5f17a06b47ec93c60c333d155c44f56cfc955ce928e85f9220da085e1

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