Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5b8d7fcc067efd…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 02:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 613ca88af6f069210378a2cbda78362b SHA-1: 88d4fe6669f0ad0fa16075a446cecc0d551347c7 SHA-256: 9a5b8d7fcc067efd0ccd8af2dc54bf8e067476452c392333ddb988e816915fc8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a deceptive web presence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://studioingegneriavaragnolo.com/userfiles/files/fareso.pdf In PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/46244046810.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/10438488464.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/maxiwumakegoxusirapufigo.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/7218440188.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/dupobetox.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/19708700446.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210916014511.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/24632066435.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/69624327193.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/lepebewer.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/50866a68583a4cc49ceddd9b31017a08/soranozag.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/dudoneluwanunanipemilek.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/golodal.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/74661138872.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/68152068300.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/bopuwelewenixirod.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/zomekoduzenizenif.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/nuvadimular.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/13479240860.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/44598017189.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/23143617457.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/fojabotazulomifodorej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=kimetsu+no+yaiba+anime+streamingPDF 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_off0000b701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB701 10752 bytes
SHA-256: 6b4e6d3754b42e91eba88af4d945d7a8af262e8da9307a8dfffdb94140af5ded
font_01_sfnt_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 16436 bytes
SHA-256: f01abcc03bb74d3673e08f175dc49e22ed210fdb3e950e96fe856c3dc09aada7

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