Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d534c1570d39b29…

MALICIOUS

PDF

76.3 KB Created: 2021-05-19 06:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5cd731c041ddd25955de34adedbad307 SHA-1: b60943c6ea4eca2671fcfc655ee97d656a750cf9 SHA-256: 4d534c1570d39b29f5d4c8979f78c5bb8b8852e11902110a660dd2f4c899c82c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing operation. The primary malicious URL identified is https://golowaki.ru/strik, which is presented in a context related to driver downloads, a common lure for users seeking software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=ieee-1284+controller+driver+windows+7+32+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454179/normal_60224be55c451.pdfIn PDF document text
    • https://womagojewe.weebly.com/uploads/1/3/5/9/135961056/novebonefodel.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/5149650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_605a9d8e7e696.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/b5f76061-8cf4-4243-8e20-a1b5c142a8aa/how_to_replace_the_timer_on_a_ge_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f69628-3032-4768-a517-7beef1202c5f/19159203237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b90459-1ab2-4984-b3be-188d3e4ec94c/relenolajajamov.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/rukozatoxuzututupubekixad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99adc859-0e5c-4391-862c-fbe9fafbd4b1/kunepenabepadejogegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a937777-0550-4c04-a6a6-c14fb59673e2/9878588016.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/ben_10_ultimate_alien_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93402474-c58c-4822-a19a-88083b3662b6/mitikozuvanumekejotizeb.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/adventure_of_tintin_apk_game.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/life_cycle_of_ascomycetes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5fe7f2a-2b9d-4fe8-889e-f00afbcaaa4c/dopizotobebosujurew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941a5cce-09d4-4000-9619-59babe10d366/63713643269.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/leonard_koren_arranging_things.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2177968c-af71-47cb-9f9e-37179f1341f6/xbox_one_wireless_controller_adapter_for_windows_10_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/noradrenaline_infusion_dose.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_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 5692 bytes
SHA-256: 5ca265ae1a360bdbf49ddd3bb910ef20d3f01a6b76fc74e2431194ab7a6f803e
font_01_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 11652 bytes
SHA-256: 8fb60fd7196ec5dbf11a8fc9c4b1adcedf00b7f1e8ec3d14e986549579b35dd3

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