Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea18b139e199b7c…

MALICIOUS

PDF

111.3 KB Created: 2021-05-31 12:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7be3d857bbd086ffdb684f4d0475da3c SHA-1: 690b8b5b80a3975efc81398c820d92fb13ca8302 SHA-256: 3ea18b139e199b7ceeb2fe9e16e4103f56a38c7c0c9e7d0784cc3c43f0205765
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/wb?keyword=como%20leer%20un%20diagrama%20de%20fases%20ternario
    • https://votebefi.weebly.com/uploads/1/3/4/7/134715150/3ee67.pdf
    • https://bobubimusibobu.weebly.com/uploads/1/3/4/7/134715312/1502739.pdf
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/6700310.pdf
    • https://paxituzupinemof.weebly.com/uploads/1/3/5/3/135303349/rusejarisor.pdf
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/5b3c07c8d89212.pdf
    • https://povurekeziduzeb.weebly.com/uploads/1/3/2/7/132740384/6758180.pdf
    • https://xafosaxit.weebly.com/uploads/1/3/1/8/131859261/1868611.pdf
    • https://xosizinunebazen.weebly.com/uploads/1/3/4/0/134017923/pidemulimosupo.pdf
    • https://cdn-cms.f-static.net/uploads/4424330/normal_605f383690e97.pdf
    • https://sawagifavemon.weebly.com/uploads/1/3/0/7/130775832/42f45f29b48.pdf
    • https://cdn-cms.f-static.net/uploads/4393197/normal_603e61293a867.pdf
    • https://rugitaroginuwim.weebly.com/uploads/1/3/4/7/134768051/xirup.pdf
    • https://gokipojunarofaj.weebly.com/uploads/1/3/4/6/134635425/cb410.pdf
    • https://zatiwakap.weebly.com/uploads/1/3/1/8/131871625/9099439.pdf
    • https://xaguverage.weebly.com/uploads/1/3/7/5/137513239/zitezabedimab.pdf
    • https://static.s123-cdn-static.com/uploads/4369760/normal_5ffef8ac0baf0.pdf
    • https://piziwola.weebly.com/uploads/1/3/1/3/131382430/1256350.pdf
    • https://nogetutiru.weebly.com/uploads/1/3/4/7/134711470/1773611.pdf
    • https://pomerizumuwer.weebly.com/uploads/1/3/4/5/134523620/wofofulagu_todeko.pdf
    • https://cdn-cms.f-static.net/uploads/4465691/normal_601965ebd5692.pdf
    • https://cdn-cms.f-static.net/uploads/4527357/normal_603d5fa72ae30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9b555057-7403-4565-85de-47a57ee28f87/how_to_check_apple_watch_serial_number_without_pairing.pdf
    • https://uploads.strikinglycdn.com/files/599bbcbd-9fa0-40e3-b539-48501a4f6867/duxugezoguvafirux.pdf
    • https://uploads.strikinglycdn.com/files/d79ee69a-1bcf-4b1e-9573-480333279973/what_are_different_textures_in_art.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000176f0.bin
58c785a1f1ab80be3c27cb879944f70ec8aa8dbb28ab9d25b8155aa450e8b47f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x176F0 5132 bytes
font_01_sfnt_off00018849.bin
ab2e8d9c81d3f82d0892ae91840d3c4b4e2f4b86eeaea07c92e2e22f5bc0faf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18849 11960 bytes

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