Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70da2a091736695…

MALICIOUS

PDF

72.5 KB Created: 2021-09-24 18:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bccb50ac90abdc9fe23f3cee18ba6f2 SHA-1: 9e2fb0d7b200c36f223088d7ef4b3afc1b7a79fd SHA-256: e70da2a09173669595f4b708573f06c01b40a9499720bdf845cee2f578187e6f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic 'SE_QR_LURE' indicates the document may instruct users to scan a QR code, a common tactic in phishing campaigns. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious content.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=what+is+my+phone%27s+qr+code PDF link annotation
    • http://vmkmsz.hu/userfiles/file/33060680962.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/52622791459.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/xojorilaveso.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6e60ce66207465580ff28e67061abb19/59950018227.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/4097292820.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/45779676816.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/49656649529.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/fenomuluruvufulo.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/golenofezazutode.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/najat.pdfIn PDF document text
    • https://eurotig.ro/file/74846798600.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210905005314.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/12457842114.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/jufepol.pdfIn PDF document text
    • http://vswet.ru/f/47251685317.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/pebanenubewitepebuwi.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/42884960373.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/rasulojibefopoxuzuk.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/rufagu.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/totojobasoroneli.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/88077554301.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/mobejovekolozun.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/razofebobalovubadokiz.pdfIn PDF document text
    • http://torgoborud.org/images/file/75964999377.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_off0000b42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42A 11020 bytes
SHA-256: 9a33f450a4910d3c7e50255330ab2a50dce8af70a2c1a1584945ed51174bfa13
font_01_sfnt_off0000cd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 18148 bytes
SHA-256: 4f1d1990701465734a55ec7bec10d2344792aa71f960a1e004677397912ce7e0

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