Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1093300bd22f72d…

MALICIOUS

PDF

81.5 KB Created: 2021-10-05 04:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: aecc262762a48e097683ad4a5755b7fe SHA-1: e9ba713ee3ed982fc8c06884bf140ef2c627972c SHA-256: b1093300bd22f72d3a6f0d55d8d01a4e37f74e4011d2a477b9b40d141450cd6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is described as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=apple+cherry+compote PDF link annotation
    • http://caratow.be/userfiles/file/69297235567.pdfIn PDF document text
    • https://htchninc.com/d/files/jidubazo.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/wefopokatelorunapu.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/wodoveropininitupim.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/34130833930.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/lirurimame.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/valel.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/33056449399.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/67871411934.pdfIn PDF document text
    • http://yepuco.com/uploads/files/70236605416.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210913171645.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/nipifajelej.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/tajawit.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/1936318105.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091315093373499.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-10/file/80412150334.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/wovajubigaravo.pdfIn PDF document text
    • https://pkbae.rs/files/46936591303.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/kakajov.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/2hpv8t2d4htmtnvr59h6bc9paj/25485257836.pdfIn PDF document text
    • https://activepymes.com/pub/file/75967533635.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/40087830310.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/papevemukasipedodokifu.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_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 10208 bytes
SHA-256: 57a64105acb18f2f7e1e2dd89cf444925ea7ded9f9a43150dec9a6031397459f
font_02_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 18908 bytes
SHA-256: 8a7290e64e02552204ecb501d4019feb9d912bdc2a30d0142690e5774ebde851

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