Malicious PDF — malware analysis report

Static analysis result for SHA-256 755636eebd3ed765…

MALICIOUS

PDF

80.6 KB Created: 2021-03-19 14:37:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 900ae4a9ac9d9f45bf41c6c241fc4a69 SHA-1: 2ab41f360699c0d40c462fab8708712fb212da81 SHA-256: 755636eebd3ed765ea77c133c0c3831d5956cac77563b3b9390ecfa98c19be6c
156 Risk Score

Malware Insights

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

The file is a PDF that masquerades as a Toastmasters manual. It contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or content distribution network for malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or content-luring attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=toastmasters+competent+communicator+manual+project+7
    • https://pupiwikupexi.weebly.com/uploads/1/3/4/3/134348736/06dc46257.pdf
    • https://wiloropijevor.weebly.com/uploads/1/3/5/2/135299547/8979360.pdf
    • https://xetamoro.weebly.com/uploads/1/3/2/8/132815737/doxepa-wubefa-vujetumo-wekeji.pdf
    • https://vifapuxup.weebly.com/uploads/1/3/4/0/134018045/ratonetixemik-pajukeguv-luxop-vimuvuxijezi.pdf
    • http://towufato.mywebcommunity.org/what_are_e_m_service_codes.pdf
    • http://palupalukagu.mygamesonline.org/olympus_om-2_repair_manual.pdf
    • https://vetudibe.weebly.com/uploads/1/3/5/3/135320479/9673218.pdf
    • https://dezuvatag.weebly.com/uploads/1/3/4/6/134667454/ac218482.pdf
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/c610b534e5.pdf
    • https://wixolovab.weebly.com/uploads/1/3/0/7/130776385/c3559485.pdf
    • https://lowixuwegula.weebly.com/uploads/1/3/0/7/130775587/marabefuzoxo_devew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_41d3e591cb084132872992eda08c1cb9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/698aa1d6-72fe-4f6b-8ae3-b26593def22e/80999448041.pdf
    • https://uploads.strikinglycdn.com/files/3d341b4c-363b-447a-96fe-0b3e6f163b44/79505299352.pdf
    • http://gototura.myartsonline.com/litesaxafikifoxisuzelo.pdf
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_28b7a45eef2243b2bf6c3dd4466aa533.pdf?index=true
    • http://zuzopejorexa.onlinewebshop.net/the_passionate_shepherd_to_his_love_plot.pdf
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_7dee5820fc3d495384cf0a4862aee5ac.pdf?index=true
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_39a7cf7906d042e0a34cdc77691e2f9c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e014abdf-ba90-4c13-becd-94021cb350d1/34120221258.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://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd67.bin
26e6d27e00234a35fac24225ca07a0a0e9e4178b9f8d892fc2af5f59763deafb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 5184 bytes
font_01_sfnt_off00010efe.bin
25a094456a599cbc6b6ba521210bc4c3a15960fd6be76fd19e6e13dca7536d68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 11128 bytes

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