Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc577e7d897846e6…

MALICIOUS

PDF

78.3 KB Created: 2021-04-19 12:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 4045b91968ded18e496dff659dc8b09a SHA-1: 548c700561e13b7861a6c8432dc0b4c3a237bb3b SHA-256: fc577e7d897846e6a7b8f8c376d06d39c25c031c1caf0248f782a0ecbdccc58d
204 Risk Score

Malware Insights

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

The PDF document uses a lure related to Twitch Prime subscriptions to disguise its malicious intent. It contains a large number of external links, many pointing to suspicious domains and PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious content, likely involving exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=how+to+subscribe+with+twitch+prime+on+mobile PDF link annotation
    • https://kutawujotin.weebly.com/uploads/1/3/4/0/134016956/18eda4481736.pdfIn PDF document text
    • http://fly-drive.online/75903043843i1sh.pdfIn PDF document text
    • http://brumbum2.xyz/how_to_make_a_plural_noun_possessivefvvbu.pdfIn PDF document text
    • http://ita-yog.space/2005_dodge_ram_1500_headlights_not_working5qvjo.pdfIn PDF document text
    • https://bemesamug.weebly.com/uploads/1/3/4/7/134722017/dosatituguk.pdfIn PDF document text
    • http://managerprogram.live/kidiwafiparldce.pdfIn PDF document text
    • http://megalit-korolev.ru/8827710841ts1un.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/lonozote/coast_guard_officer_evaluation_report_form.pdfIn PDF document text
    • https://d798de41-6847-46d1-b877-4f1b84f556ee.filesusr.com/ugd/3e315c_b5aef95a59f14d7a9d98d282d7c307b5.pdf?index=trueIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_aea2b22314224ac4bc48150b4105fc8e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a7b421a-5857-4130-a570-83bd1ad5454e/healthcare_operations_manager_jobs_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/how_many_carbs_are_in_a_dunkin_donuts_hot_chocolate.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/nuwepojimijokujalazit.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_da014e40757349a2846b8eb3fbaa8a76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e6c7f4-b80c-41b8-9fd6-48f8f22eb62e/how_to_repair_washing_machine_gearbox.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/confluence_templates_and_blueprints.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e9271e-4ec5-4c16-942b-039ae9c2fcb7/pesepuso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 5156 bytes
SHA-256: 4d596179c9407a9969244417fdce5c2ed5faabb1e48f3034b040f04055778014
font_01_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 1796 bytes
SHA-256: dfab3945eace5ba27be1ad95d63d5142397767eab6bca27773794b33bda2302c
font_02_sfnt_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 11328 bytes
SHA-256: 580fdc2e046832a9b78aa188b7b5abc2e1e642b3470f016f69fa4d65540555e0

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