Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcad01686fd3625…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 17:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e128dc5c1d23ba570f5b466da6cf07a2 SHA-1: d7abf74b5726ec1004d00150addda7a0a617676e SHA-256: 6fcad01686fd3625cd0015461fc28c2d3e8e850b1a03047d3c8ee30b36ff78da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm with numerous distinct hosts. The embedded URLs, particularly the one pointing to 'zamdq.com', suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://zamdq.com/filespath/files/20210902093420.pdf In PDF document text
    • http://tid.vn/upload/files/70729864330.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/pugofetuguv.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/sejapepuwujiz.pdfIn PDF document text
    • https://airbays.com/userfiles/file/26957138645.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/44594100341.pdfIn PDF document text
    • http://myesen.life/userfiles/file/14380090969.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf15e2a87---sugos.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/65446866113.pdfIn PDF document text
    • http://video-cycling.de/files/file/31896670241.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/namesegu.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/20708801334.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/kekebafawepibikulakuv.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/videzuje.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/vabonikisesawapuwasoxedak.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141142fb2c64---94708456208.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/77117262091.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/lapuxezupifiwovid.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/71096265693.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/46253651702.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/78126936577.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/topibejotinogema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vpn+free+vip+mod+apkPDF 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_off0000d6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 10472 bytes
SHA-256: 0c241582739ce6de119151f020e99cd3ed0e252815b3d936e089c44e95a229db
font_01_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 18232 bytes
SHA-256: edc2d67270a6b478c8767dca0d9c74820bd97952b8db9be2e6cecf8f59ab81b9

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