Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9a90971830463f…

MALICIOUS

PDF

80.1 KB Created: 2021-03-30 13:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d08a5114dc70e6594d672483660d04c SHA-1: 773ce1cd5ab99c85114f4926a9d7ccbcec89421c SHA-256: ee9a90971830463fa4de505bc833c1ec2da98b89ab1099efcab78db68c835965
156 Risk Score

Malware Insights

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

The PDF document uses a lure related to 'Zoom video calls' to disguise its malicious intent. It contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF files, suggesting a link farm or redirection mechanism. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/aws?utm_term=how+to+use+zoom+video+call
    • https://jaxenexeleti.weebly.com/uploads/1/3/5/3/135320290/5630848.pdf
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/bufutuwifelaxi.pdf
    • http://bafakuvim.sportsontheweb.net/30666542937.pdf
    • https://maludanojuwido.weebly.com/uploads/1/3/4/5/134591959/1395280.pdf
    • http://jokojujut.medianewsonline.com/tuboba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suvowafavij.epizy.com/nejoxekuvaxiseraxet.pdf
    • http://dojorunubi.myartsonline.com/ana_catalina_emmerich_antiguo_testamento.pdf
    • https://s3.amazonaws.com/nilafafakem/90899363317.pdf
    • http://xepatodop.onlinewebshop.net/47596324876.pdf
    • http://detekoxinusogux.epizy.com/bepufugovovofidibif.pdf
    • https://uploads.strikinglycdn.com/files/9f0f0f74-16ff-4cd1-804e-24a9e40e0228/who_is_the_new_finance_minister_of_canada.pdf
    • https://uploads.strikinglycdn.com/files/a2ca9711-daed-4beb-a4d3-d85839ead985/wiziporibiluvoniv.pdf
    • http://gogidovegesoxe.epizy.com/antiseptico_definicion.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/how_to_fix_chain_oiler_on_poulan_chainsaw.pdf
    • https://uploads.strikinglycdn.com/files/c1913b30-4d8e-4572-a3cc-d3e1f2b1a4b9/botux.pdf
    • https://s3.amazonaws.com/rodiligarexo/nubozuxofefenanuvetovedel.pdf
    • https://uploads.strikinglycdn.com/files/42ae1832-ca52-4bb1-8ef0-093c4ce90b67/govixewuf.pdf
    • https://uploads.strikinglycdn.com/files/580a549b-1012-4970-88a4-a494ab9346ee/52018207546.pdf
    • https://uploads.strikinglycdn.com/files/5ce9e748-e7ba-46f8-a3bc-5497c4da5997/will_gamestop_buy_a_xbox_one_controller_without_battery_pack.pdf
    • https://s3.amazonaws.com/sorapobuk/70488313949.pdf
    • https://uploads.strikinglycdn.com/files/44f0ac9a-eb63-40a0-be8a-c6c1d3bd917b/how_long_do_you_cook_a_turkey_in_a_oil_less_fryer.pdf
    • https://s3.amazonaws.com/tigewibejageju/varurinagelatex.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_off0000fc5a.bin
7d9202f13c1aaea266fd0ca4fa2ed0efc9117acb9a57f6d477b8d7394995f5de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 5152 bytes
font_01_sfnt_off00010de9.bin
fd607b621f2e550696e50c776516df5d64436b1a6607a20e88f47e85fda8c69d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 10864 bytes

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