Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecc28fc9f0a4eb6…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 13:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: aee4320e7fc2bc08028c0f36d453e0d4 SHA-1: 7e416e050999e75c4572ce318fcb651443203676 SHA-256: aecc28fc9f0a4eb6a19d2a86011774c9a1799390a00e97c0b2d31da6fd46f7dd
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. The document contains a large number of embedded URLs, many of which utilize UTM parameters, indicating a likely phishing or link-farming scheme. The primary goal appears to be redirecting users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=aimbot+battlefield+1 PDF link annotation
    • http://hb-hospital.com/file_upload/fck_upfile/file/68861050211.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/70575333719.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/50081751922.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161434d8ebe346---tutifax.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/73165174217.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/11067358407.pdfIn PDF document text
    • http://artepcb.com/upload/files/beribosetavurimas.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/bosalabaruniwukotoro.pdfIn PDF document text
    • http://becucci.it/userfiles/files/pujotesuzugelowufupiv.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/vivolomulubipazopevu.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/kigegos.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zixajajuk.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/19546782157.pdfIn PDF document text
    • https://digireg.se/upload/35240170793.pdfIn PDF document text
    • http://szjg.hu/images/file/wesuxawijerat.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/5368492051.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/pomoguzuvirasanepus.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/20813606179.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/8jiaes47sfarojcqg6u2nqkqo4/gurolezikimufinereganuvu.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/nimavazelukowipo.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/12786353617.pdfIn PDF document text
    • https://beaszemin.com/files/33738804339.pdfIn PDF document text
    • 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_off0000b9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C6 10316 bytes
SHA-256: 3694d8631d36ad1f60140034a1530826550738f7c51e259847d51a71671b2de0
font_01_sfnt_off0000d119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 16312 bytes
SHA-256: 0fbe646c37e78dec295608521028249595708d99c11546acf1835fb8d0f750cf