Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe7f484e3bf3e79…

MALICIOUS

PDF

75.9 KB Created: 2021-03-20 04:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 49db09c79773bb64bf081773ce4007b2 SHA-1: a6bd3e1e8842a00178bfff18af0dbc81242d48d1 SHA-256: fbe7f484e3bf3e791a67c5fe6d82dbd30e1bb456f869a1fe38f3bec2b53a64b6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many pointing to disposable hosting domains, suggesting a link farm or SEO spam campaign. The presence of a URL with a 'utm_term' parameter indicates an attempt to track user clicks, likely for malicious purposes. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=how+many+parts+are+in+a+ar+15 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368969/normal_603994e1b9f2f.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/meaning_of_national_development.pdfIn PDF document text
    • https://sevakozo.weebly.com/uploads/1/3/4/6/134677934/b94ee081d4e.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/3265961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496810/normal_6033a1a1961d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_6020fcc0e0443.pdfIn PDF document text
    • http://xarapover.mygamesonline.org/deep_learning_ian_goodfellow_github.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_6031e7e3c2da3.pdfIn PDF document text
    • http://gusevoxuzuwelap.mywebcommunity.org/how_to_set_up_dish_remote_to_samsung_tv.pdfIn PDF document text
    • https://zipelademijup.weebly.com/uploads/1/3/4/0/134017001/zakarawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_fa62ad13ccc54cffb7357fa688661655.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_a01930032a0040a68cbc827fbe93a5f4.pdf?index=trueIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_da7deea8e512493584de0a0899543135.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_e8117fe8a43e43878a9bf89f27b0bb91.pdf?index=trueIn PDF document text
    • http://vibirokudod.myartsonline.com/daxuladajafeluwojuz.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_c09619651a32496b99197731abdf3cd7.pdf?index=trueIn PDF document text
    • https://49884795-3b66-401c-adaf-b59e999553af.filesusr.com/ugd/8bd6c9_2814e84063d84421ba80da54a39d832e.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_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 5264 bytes
SHA-256: 427b0dd4a64599941c5385241828fcc3738ca34aad46df95051397a89fbc570e
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 10616 bytes
SHA-256: 691225f599c5570e3577ba25d4d56bace3be5d332dc12168826d5cbf11bdfa0f

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