Malicious PDF — malware analysis report

Static analysis result for SHA-256 a340d2b663e89c86…

MALICIOUS

PDF

75.7 KB Created: 2021-03-20 20:03:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b8aacfeab2742f23cb9bfd943dfcbf3d SHA-1: 7aacb5d2b5b01b6700da504c237415fb942afd8b SHA-256: a340d2b663e89c8673b04d17ab360c4bc60cb8482b09d5f6ed3b9317c987c058
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://midufefew.ru/strik?utm_term=how+to+clean+jenn+air+glass+oven+door. The document's structure and the presence of many links suggest an attempt to redirect users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=how+to+clean+jenn+air+glass+oven+door PDF link annotation
    • https://cdn.sqhk.co/dufelogaruf/ggyhcge/vubefon.pdfIn PDF document text
    • http://madamzero.com/205674899564dwux.pdfIn PDF document text
    • http://fejelomixariji.22web.org/firefox_49._0._2_32_bit.pdfIn PDF document text
    • http://bukezisafa.iblogger.org/katamorodimevi.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/f7hjUAV/82012091730.pdfIn PDF document text
    • http://lovemecompletely.com/sujivagamamak2w1g1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b59097d-d28f-4719-a5be-7f4d34c11fab/32820493049.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_e196f33bb71c4da2a3649ecde719d831.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd5a8e7-4926-4866-8a92-efcd84091fb0/nanajuzazevejizamibedode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6deb76e4-ba1c-4a34-8463-08d05fbe64e2/dowoziwusixovajamari.pdfIn PDF document text
    • http://gugawojakopa.rf.gd/fakapapufolepudopiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2adaf17-f7f1-4623-96d8-78c7f67edac3/how_much_do_homicide_detectives_get_paid_in_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f1fbde1-972d-4c35-a280-8d9eb6a9a523/tipozujoriraxazotomutoki.pdfIn PDF document text
    • https://d7e981a8-8c4a-445e-aef0-60d3d4911bd2.filesusr.com/ugd/65d69c_95bce373d1e54884908a3db492dcff6f.pdf?index=trueIn PDF document text
    • http://midexudotag.epizy.com/rimesutenemidinewixisa.pdfIn PDF document text
    • http://fabowifomewod.epizy.com/ss_bolt_torque_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e1974b-e606-4867-bff2-cdaafbf5a626/oster_golden_a5_single-speed_clipper_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/591d70d3-7417-4f07-bc69-42a79f2e88a8/bowewexefedigesebemamagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55eaa72b-dafd-4b37-943d-ee9a815953a1/crane_cool_mist_humidifier_no_mist_coming_out.pdfIn 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_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 5296 bytes
SHA-256: cd6281a01342137c7dde543eb2eb3b0c63c55cd3abddbaee1c3066ab6a14a2ec
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 11052 bytes
SHA-256: c3858c78326bbfe1a1dce1c107545e8a51302a2b82ef8de6ffac05b16af7d768