Malicious PDF — malware analysis report

Static analysis result for SHA-256 173990ba4005ef97…

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 16:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: afa825e4bc4bac385d48200cd0b85996 SHA-1: 25915b1210ecbb969b8d70c44c82d750c9a5c656 SHA-256: 173990ba4005ef97a92173d6712d683892d77cc04750171136bf64aaf67ee6f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=the+odd+life+of+timothy+green+full+movie+with+english+subtitles PDF link annotation
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/40473008928.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/8820784665.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/nixizewilepemopur.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/97894619093.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/46620767003.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/jarofajepov.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/wilewebupoladejupaf.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/kosuranugidudewazok.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/pobufuxide.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/jugisodekefivaxiripatuver.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/nuxixatajokut.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/gulirupigemarejuka.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614211e9358c9---12117293466.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210917_424D6DABABEA9BC2.pdfIn PDF document text
    • http://khamranghaiphong.com/upload/files/waragowasewuzavekufigetam.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/79758797164.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/sisokole.pdfIn PDF document text
    • http://karczma-zaborow.pl/userfiles/file/numopawagemamogitudik.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/fixovamepoluw.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/76097502661.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/54404744923.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/83105364380.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/3971466478.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/54645418790.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147565462a4d---worob.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_off0000b403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1A 11108 bytes
SHA-256: 5e614c397378cbbd601454976583a9f59bb74ed7a0b6f80e0093c47b38e2a1ea
font_02_sfnt_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 17356 bytes
SHA-256: e820554effa20bbf488630e2f0988e44ef8e8fef76b719cd9da054a9ab248fd9