Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dee7bb33579bdd1…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 05:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 818442bd42cc8ee912891a001278aa4a SHA-1: 9a041a5fe4f7a8db97b4d79b527c1e1444e17a66 SHA-256: 9dee7bb33579bdd1c758935ce46ed186162005d9e3f6c3e9cbb0383caa8bb8fa
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, with heuristics indicating it functions as a link farm on disposable hosting. The document contains numerous embedded URLs, many of which are likely used to redirect users to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an intent to exploit users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=the+one+year+bible+reading+plan+pdf PDF link annotation
    • https://atputasbaze.lv/images/userfiles/files/85256858721.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///13318265966.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/36992622441.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/karoreredoxokow.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/62964499917.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/7784038504.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/17679721398.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/67343642929.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/vixizazonozubimi.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/95185709761.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/97309102400.pdfIn PDF document text
    • http://khocabien.com/uploads/files/kafarulanazuwubuxefufofi.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/5917003936.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/jajoputixukudodufemoga.pdfIn PDF document text
    • https://ibericadearmerias.com/file/jasapabinomog.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/vinomolepidajutik.pdfIn PDF document text
    • http://samtle.net/ckupload/files/57672804087.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/97207273544.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/romiguwalaramiwixikenuv.pdfIn PDF document text
    • http://turnyras.lt/Files/file/tuvodul.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210923035158.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/84180512366.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/zilibipekozefupunaxexejud.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_off0000af5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC774 10728 bytes
SHA-256: ef8c760d0c0cfc44f19d26b69cf723cdccd4b0264b25c9cae1d73856279a0896
font_02_sfnt_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 16952 bytes
SHA-256: 8bda4c669f8a52f88af00becf342c0618f503504b67a2b9417133957f1280cc5

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