Malicious PDF — malware analysis report

Static analysis result for SHA-256 c331cc26560e12e9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 03:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cbaa821222234fcb99ee48857c4938c2 SHA-1: e94d148b79a83b986d5a3aa318da3bd9c98b5aa5 SHA-256: c331cc26560e12e973af04e5d2ec9b7e72e151d98baba1a625fa7ce3758b8633
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure itself is used to host and redirect 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://gaziemirkentkonseyi.com/upload/files/powijavikom.pdf In PDF document text
    • https://megalightgroup.lv/uploads/files/81404399629.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/93880168518.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/narasuzapudekawedafo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312dc3a80f5---towuxifop.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/kixazuv.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210916071850897.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109150237395897.pdfIn PDF document text
    • https://mallenmediations.com/mallenmediations/images/userfiles/file/73362119035.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/48602471304.pdfIn PDF document text
    • http://reflita.lt/uploads/files/79134703130.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/60643046872.pdfIn PDF document text
    • http://hybsch.it/upload/file/wumesokivoriziduti.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/78007824370.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/purafep.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/bumajovumokekatopevozi.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/67734708724.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/pinafuvidularavo.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/duwesejoguxozodorugotub.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/82172562645.pdfIn PDF document text
    • https://menu2uplus.com/images/file/60654229940.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/kigufudof.pdfIn PDF document text
    • http://teknis.it/userfiles/files/potofulemesute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=top+android+game+2021PDF 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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 17284 bytes
SHA-256: 47035518578781f5da23ed136abdf09e111d0cd85754f7ba8169525189eaa168
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 10680 bytes
SHA-256: 37bdfe0e6d0225eda41de075453768b458208c54a98f34bc742f4c398911e2c7
font_02_sfnt_off000121f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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