Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b9a7055e2485a0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 19:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8d3b4ab9995b3eb5a9c255fbed85cdf SHA-1: be84a7232284572e968f50f2a1eb7e4d9306fa48 SHA-256: c5b9a7055e2485a0d0dba3609c65850055879b4cf9eb1c62cfdde1e119978fd5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm designed to redirect users. While no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://ambulatorioveterinariorigolon.eu/userfiles/files/xajutijiwedi.pdf In PDF document text
    • http://touchpanelpro.com/upload/files/72213704052.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/tovetaxizi.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/30578114372.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/milebatifekuxogaw.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/sebok.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/69073246102.pdfIn PDF document text
    • http://quranday.org/userfiles/file/2447053522.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/35065146359.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/33635487477.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/pemibeninimewawilemefew.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/3817314176.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/77973970908.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/208322417661449e3026417.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/lutabopudulav.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/abd9dd29c08d845549c30b3fbba57b02/58708719307.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/zemetalaleka.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/77205664355.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/43038979547.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/55707787762.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/mebixof.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/22396334736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sincronizar+android+con+pc+wifiPDF 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_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 10392 bytes
SHA-256: 972a504a84d484f6fbdbd36f33c644c5a89e53b9ce9140355a36c18f0327387f
font_02_sfnt_off00010d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 17904 bytes
SHA-256: 0d30ad76dc10353bfa009cfc7bdf8d025a2f013a93e6bae5ce01b8b66d49151a

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