Malicious PDF — malware analysis report

Static analysis result for SHA-256 87acadc1bcc881ca…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 14:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 713d3946d4cc676018942e108ad4847d SHA-1: d8caddfa9ea674447c0298db84bcad06ea3b1f84 SHA-256: 87acadc1bcc881cac9ec28fcc28a62bbdfe41bb481399933b43c4270c9d1be66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.psk.com.au/application/third_party/ckfinder/userfiles/files/15992811108.pdf In PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614990fa87d98---levajezafalev.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/22352327063.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/60596889788.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/50610768626.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-3/20210903064742355329.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/vigidelebutos.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/rozukofija.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/fodujavolefegowabureb.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/povezipade.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/41fb3b1f7104b1e98fa8d9843b7187d7/jujusedexudakegipuval.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11523015845.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/42079815894.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/miratiwetogut.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/nisexirirewonu.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/23698948473.pdfIn PDF document text
    • https://bursac.net/userfiles/file/tufewegisutezu.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/dipakilafivudopexorut.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/96210842237.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/43848159955.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/gigokimunen.pdfIn PDF document text
    • http://handgun.ee/media/file/77780857205.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/23782944918.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/94090068499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lidar+scanner+app+for+androidPDF 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_off0000aeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BE 15300 bytes
SHA-256: a908b7f11042f486aaff2a0a6ac1eef3bfb5cf34cc78fbac1aa7fd3d3af38aac
font_02_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 10428 bytes
SHA-256: 4bc1e052009c9a1abd859e4a883677e3cd9c59d173c218a1fc5b01dc328e60f9

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