Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6541ef2abc816cb…

MALICIOUS

PDF

82.3 KB Created: 2021-03-25 08:21:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 98292645c474c0a962176ee40b16f896 SHA-1: 94ac78b80bd4cd42eae1e9e83901f7f14c1cf34c SHA-256: b6541ef2abc816cbee7ac54f8451e88dfe57d30a7422c31a905c4f437ab24071
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/wix?keyword=chapter+20+study+guide+for+content+mastery PDF link annotation
    • http://mizafaroremida.getenjoyment.net/soruzirowunepozalemitevis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475852/normal_5ff8d64633f3b.pdfIn PDF document text
    • https://xopapukewude.weebly.com/uploads/1/3/1/4/131408664/retebirorojalazezer.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/yZjddpP/to_the_moon_and_back_hollyn_lyrics.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/acrobat_reader_edit_crack.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/cjhjeCH/boland_college_vacancies_application_form.pdfIn PDF document text
    • https://mogogumabes.weebly.com/uploads/1/3/4/9/134900096/sakinavoxoli.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/what_is_statistical_estimation_of_scale_economies.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/walking_dead_all_out_war_rules.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/baribibugobilewuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_60147c4476b60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_6017a07189052.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384640/normal_5fe2875559197.pdfIn PDF document text
    • https://godebisexizo.weebly.com/uploads/1/3/0/7/130775633/aedc5165d0.pdfIn PDF document text
    • https://sifajovu.weebly.com/uploads/1/3/4/8/134874608/siduludepugizuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/ZQbS3az/morinorererex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_ca5fac4276124b6092f63143dda6b22f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/6558273385.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_9331b3fb343c4465bead28ca075ec233.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/work_from_home_policy_in_india.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_c40731c705f14856a508c88fc39f5194.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_2fc4c40503a048f7a21cfd39ada71e23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/keurig_b60_troubleshooting_not_ready.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_d73f3691b3dd4ab592234b150ba70bc6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jobavo/92393446606.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_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 5820 bytes
SHA-256: 7d4db77629c6b207de4827c4ce5e57f7f6c9c9fd84f807de2851c37db7d2cb3a
font_01_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 11312 bytes
SHA-256: 369d4ea878b4ab3744956373c20438fb71fac9792b645cc2649b78416f87a61c