Malicious PDF — malware analysis report

Static analysis result for SHA-256 f350fb19e13bf25d…

MALICIOUS

PDF

81.0 KB Created: 2021-04-06 20:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: dfcfff2d5f3b6348cbee389f7d3cc9b5 SHA-1: d8466824808b48313c6114de887c97cfb8f80473 SHA-256: f350fb19e13bf25dcc8ae112269433c79e906b50f59726a4624bb8e7c80389a6
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one URL pointing to a potentially malicious domain. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. The embedded content, though heavily obfuscated, suggests the document's purpose is to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://mezovuduw.ru/123?utm_term=datura+trip+report PDF link annotation
    • https://kerozuvesiduzam.weebly.com/uploads/1/3/4/3/134375161/b0773c91d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_5fea25a94b1ef.pdfIn PDF document text
    • http://tapagigozi.medianewsonline.com/gina_classification_of_asthma_severity.pdfIn PDF document text
    • https://webupusew.weebly.com/uploads/1/3/5/3/135344455/c5570e551d731d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409258/normal_60085011bcd69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5fceb1981c049.pdfIn PDF document text
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/4428371.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/nGgehh0/azaria_chamberlain_bones.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475580/normal_60017efa1f675.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/gjzOFiA/tankr._io_tank_real_time_battle_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416322/normal_5fd06a3cd72d9.pdfIn PDF document text
    • http://pewujok.mypressonline.com/austerity_measures_in_zimbabwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_94b57e20797c490c8d3b984da1dbebc5.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_327b42696865406ebb478485ae6d795d.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_cc165320b9b046c7a89f2308c3087ece.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_f46d2dcf448449839783696b63ad2e5a.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_6902cfe473424e2b92761f0cba68f0bc.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 4600 bytes
SHA-256: c04ae431029618b23ca41e48f1c97bc9e986ab3053e204b9fb4d1d4c79b6d515
font_01_sfnt_off000110ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 11904 bytes
SHA-256: 16d02d7b4b3a1b507e84e17c19b78a8a1d40adf0f1e30ef0498cad4e6797bfa4

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