Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64167653bc4cd48…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 05:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09821209ac20fc35a2ae3e3a6ff0ab66 SHA-1: 9186bc3268a3fc5db9f6b597463e4179534fe40a SHA-256: a64167653bc4cd48c48f5e96d3d42e764f0fe4154843623c8b3ae3a77146c483
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or low-reputation hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=cricket+pitch+size+tennis+ball PDF link annotation
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/21971575999.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/zomotowobigididawa.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/7203407554.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/95855588298.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/zexopunemene.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/safidip.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-05-02-55-28-61.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/kuzefufadizivilejijet.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/68732148262.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/zonavotusudimitujebigus.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/26918003236.pdfIn PDF document text
    • http://nktrading.qa/file/files/dimibuxelarezotupunetoto.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/gabajizisuxom.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/61253281005.pdfIn PDF document text
    • http://elma1.ru/!upload/files/dexilotezulivifame.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/89252854544.pdfIn PDF document text
    • https://nexusmediation.nl/files/98282237802.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/78482273138.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/94445628982.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/movebevelitoxepino.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/3566848793.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///21432268908.pdfIn PDF document text
    • https://cardolf.ro/files/62657609411.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec7ee23878---sagawisugarariduwoge.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_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 10672 bytes
SHA-256: 062de0bde37652fa8ef1d4f476a6d6506ae4f1bd7944fd529c22ae31ec71d215
font_02_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 17124 bytes
SHA-256: 8c481941a6f7da9346534514e9f67c4cc4c5961655dcf888f92136085854505f