Malicious PDF — malware analysis report

Static analysis result for SHA-256 8537766add7f4b80…

MALICIOUS

PDF

75.2 KB Created: 2021-04-18 19:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 85fb61cc789374194bffe95f1216cf80 SHA-1: 583e09999fdfa2e3a07cf3707558acaf1128e739 SHA-256: 8537766add7f4b806030f72f89208c2a237ee1012a1bf5caee748803854ea57c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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://vilenefex.ru/strik?utm_term=rca+vhs+camcorder+models PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473654/normal_5ff1c930b15ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_604669f5266bf.pdfIn PDF document text
    • https://wiguvufa.weebly.com/uploads/1/3/0/7/130775639/vawusarov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452206/normal_5fde2e1c8323a.pdfIn PDF document text
    • https://waperaterorug.weebly.com/uploads/1/3/0/9/130969933/cce1a4e805.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/2548155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5ff54f805b798.pdfIn PDF document text
    • https://sekepavikaforo.weebly.com/uploads/1/3/4/6/134608196/genojamufamivopigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486982/normal_605548a171d37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedogevakubonog.epizy.com/aamc_practice_test_1_question_54.pdfIn PDF document text
    • http://vipiwimepi.epizy.com/new_elementary_mathematics_syllabus_d_2.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/broadway_accompaniment_tracks.pdfIn PDF document text
    • http://puteruwegadijem.epizy.com/sales_order_process_template.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/zupetowopugom.pdfIn PDF document text
    • http://jiforexawa.rf.gd/61754806030.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/tinutatijunasufi.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/senovibopigebesi.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/60980198238.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/college_football_picks_week_13_bleacher_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/31676042516.pdfIn PDF document text
    • http://muxobuduxude.epizy.com/43972807185.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/degeju.pdfIn PDF document text
    • http://bigefonivibog.epizy.com/powerpoint_presentation_example.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_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 5244 bytes
SHA-256: 6c5c83aa78b680fe091f0824ae24bc8fcb2628d1afe0b060032bd8fb94cb4ca4
font_01_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 10608 bytes
SHA-256: f236149f9acca77a10e00bdc6b92fe4ae419915aa193bfd916da57bbf4097594

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