Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caad8aadff98a29…

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 01:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59f50cd65663898d61c100e960fa3beb SHA-1: 1afc3e9283f73b0a01b5def062269b3612545d38 SHA-256: 1caad8aadff98a2976521515cdbefb2b1efea77a7cf7b9c0b0a83814115e808c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external sites.

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://garglob.ru/uplcv?utm_term=things+to+do+with+a+tablet+android PDF link annotation
    • http://lyzebrno.cz/userfiles/file/96017590699.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/81007351320.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/70202515497.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/jugamogogoguxexobugejo.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/beliluzum.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/kegazikofozudimitur.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/bovozezufujoresivu.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/jimagogikajetogep.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/relavitafonalaw.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/pozikurasugo.pdfIn PDF document text
    • http://watch62.ru/files/files/64831604581.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/58035118455.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60361ec27---gererukuvu.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/2165905611.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/xifotibakiduzalilutizara.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/gologorepugarigonazuz.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/88485777918.pdfIn PDF document text
    • https://truyenskyt.com/upload/ckeditor/files/89803221305.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109120206376399.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/30529860463.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/99904177205.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/xazofajirotubaruzewog.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/17910300487.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/68600154159.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210902215913.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_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 10716 bytes
SHA-256: d06e6e3b0cb6ddc1b016d51f90543102280e82661e0a96bfc1cca770b1d56ed7
font_01_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11066 17652 bytes
SHA-256: 50c548a2707c67b312ec174f8dd586ef41c183773454b14541b04560875c1820

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