Malicious PDF — malware analysis report

Static analysis result for SHA-256 f958c58b031ae1e7…

MALICIOUS

PDF

88.6 KB Created: 2021-05-15 04:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 694b01d0f754415689d2674b857a749a SHA-1: 2597aa0f744e6ba9ac5102066e001a97cbf158c2 SHA-256: f958c58b031ae1e7ff6308029f65a2cf3873b35fe049394a1ecc444557d63406
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of a 'download button' heuristic suggests a lure to click these links, which likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/strik?utm_term=girl+from+ipanema+stan+getz+chords PDF link annotation
    • http://gooddevice-online.com/toluvasukotepn0ur.pdfIn PDF document text
    • http://bighome.space/learn_to_draw_for_adults_books0k7hu.pdfIn PDF document text
    • https://bumipavadawafez.weebly.com/uploads/1/3/2/7/132710759/4047325.pdfIn PDF document text
    • https://galebekamabe.weebly.com/uploads/1/3/4/3/134305591/xikozolutiwute.pdfIn PDF document text
    • http://alexsaf.ru/the_tcp_ip_internet_layer_performs_functions_at_which_layers_of_the_osi_modelj8nbs.pdfIn PDF document text
    • http://katermore.ru/buwevobapulosurtklvj.pdfIn PDF document text
    • https://tojibigunezo.weebly.com/uploads/1/3/4/6/134644172/zatebu.pdfIn PDF document text
    • https://jawokisejul.weebly.com/uploads/1/3/4/6/134601468/mapolivanegik.pdfIn PDF document text
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/1082371.pdfIn PDF document text
    • http://tuvosudokalidu.scienceontheweb.net/26344779916.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/what_is_the_importance_of_critical_thinking_reading_and_writing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/metakibeme/kimovapu.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/zunolifexi.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/list_of_clinical_teaching_methods.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/hemoptysis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/bumefutabexilogovewabar.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_64aa2f2f19f64ff9a21860e0b8b23ded.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/3489413582.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_ea3ef2c079cd453a810fe20c3dd18be7.pdf?index=trueIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_a592f4978ec047efb4995fe1740668fa.pdf?index=trueIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_12bc8a52af564981a0cb5eae5244253c.pdf?index=trueIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_be68dc19c85046dcaf7ba46833515104.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_2bf464d7e7d74bd79ae76ce65f93496b.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_af7e407552984ae3a7c3462851c11abc.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_a25604b97f80483299ca7ccf6e96007f.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
    • 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_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 5652 bytes
SHA-256: 9bced89a833cc1043f824bf3134768309aeeedaeecc58e5d0b9c31e8214873be
font_01_sfnt_off0001169b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169B 11668 bytes
SHA-256: 6ee9688d0e8b64135cebd1c9ba1cfc27812650c347f980bab05a4fe2f3127868
font_02_sfnt_off00013da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA7 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12