Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6323d49e725cca…

MALICIOUS

PDF

86.7 KB Created: 2021-01-04 00:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a0a7652aa103e83ce1491c5492d5ecbd SHA-1: 999ce309dfb878eb6cf945521fa9944a37eacf65 SHA-256: 4f6323d49e725ccaa75482ff2d09547dc5c372ef35c8467d54301482377e631b
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://trafffe.ru/aws?utm_term=tulja+bhavani+songs+marathi PDF link annotation
    • https://valabokewem.weebly.com/uploads/1/3/5/3/135311070/xoxotolexifaj.pdfIn PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/626386.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/7e2a291cb232d65.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/mizawal_dazijin.pdfIn PDF document text
    • https://vexepediv.weebly.com/uploads/1/3/4/6/134668456/e5a3ea5e.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/ad6cd76c5bef6c6.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/f994c82857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_5f9aae4b1dc60.pdfIn PDF document text
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/fudavepulupunup.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/8073431.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd91965-a137-47c6-af59-1ca394bc0228/nuludolopadeboja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8257dd96-cb9b-4bb2-9862-17a6c5e6010f/ff15_adult_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d63963e-f2de-4bd4-9e91-9beda2e597c5/jixavofulelujejebom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e2e796-274a-4a4d-8cfb-42acbfea2e49/kezefabaziraxajapenepibox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83cf677d-c394-48d7-9255-7a69113bb4e7/hells_revenge_moab_atv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c1d5f0-d8f0-44f4-876c-3e2e189807a4/zekeneduzenesuzitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e58ea3a-16cb-4335-9f34-9bc83de1da39/34897443470.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001240c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1240C 23452 bytes
SHA-256: cdd09628803551bb114608203f3dd15c2e0bfb904c691a8226a0770817a3c926
font_00_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 5324 bytes
SHA-256: 8b07f44cb24e902b585f6bc10c6dcc1d5d230022e2161d31543f3aa1ce4b8949
font_01_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 10852 bytes
SHA-256: 5d20689c1172ce3edcd35eb698e864bc247cc9cfea8a968511286607c67077ec

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