Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e708fd9261d604…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 15:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 68ed1aecfa78e8261d4f40786404a69e SHA-1: 8eeae4f6b536cc4b7f53c889929b98350b4dcfe1 SHA-256: 56e708fd9261d604cd92aec264a396d723fbd009f1b620d250ed151dafd6d707
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, and a heuristic indicates it's a link farm. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://christ-china.com/filespath/files/20210916154406.pdf In PDF document text
    • http://tele-klass.ru/i/upload/files/motanutidizaripaxixoba.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/13695266927.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///1526066480.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210904040017196.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/87255506210.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/zasumoxezarorigamep.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/92903249052.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/94739761578.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/tatixax.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/nizigavason.pdfIn PDF document text
    • http://deltools.com/userfiles/file/56520671887.pdfIn PDF document text
    • http://cartopack.com/Images/file/juliwadejetat.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/xefenilevol.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/58202318329.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/tusaxarizivijasosawejug.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/58138020562.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/2514179656.pdfIn PDF document text
    • http://chikatere.com/Upload/files/nuwudufaziz.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/kebax.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/bagutatiralibovoxej.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/nenojevomexiwut.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/95645146544.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/68453786684.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/basis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+browser+with+downloaderPDF 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_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 10552 bytes
SHA-256: c8227ce09aab8d7014cd0b3ca2e2dd3d4b19c7e82c454ef5a49be25d93354b54
font_01_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 17884 bytes
SHA-256: c32d9097dfa78f9877257a070cce96ed1fbdd1d1f7d22babbb859e401c904986
font_02_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1