Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f178beb596821f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-24 05:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1da2fd3c4aef424144a00189fdfa8f8 SHA-1: 40cb599bdc287a9677087389acb0371398c69932 SHA-256: b5f178beb596821fb7f77d4fa369e3a704d84b2c992600bd271678be5feb63b4
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying a pattern of many distinct hosts with few links per host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://swaarm.de/app/webroot/upload/files/zorokogi.pdf In PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/51262533757.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/kirazosenusupusi.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/kurutaluledu.pdfIn PDF document text
    • https://schmitz.cz/res/file/gezimederuzifefivifixuvad.pdfIn PDF document text
    • https://cncunse.com/d/files/6559959144.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/94029273306.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/85353459537.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/47421832780.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/34280030678.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/siwutulazozifafe.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/xawabi.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/50312577013.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30117657032.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210902120636.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/81939594756.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/bekatuxukot.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/bavitutavobakosil.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/631333e46434848b091adb795b14c91c/25907698184.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/sibanesupepeve.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/lujivafuxebegi.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/dodojusigiv.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/tikugalarowasumugosu.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/30343088236.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/gakuguvetojifuf.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/37074618193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=manhattan+prep+gre+set+of+8+strategy+guides+4th+edition+pdf+free+downloadPDF 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_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 11356 bytes
SHA-256: 32f621c07c45c0ee0370de31ae9cc8c8855a42e893f9d94cdcc704e52402d0fe
font_01_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 17804 bytes
SHA-256: 24cc72c84abf70a74922c31212121fb17172dc9d774e9073719991834bef6ba0