Malicious PDF — malware analysis report

Static analysis result for SHA-256 4937e87cd98a10e6…

MALICIOUS

PDF

76.5 KB Created: 2021-02-14 08:50:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3e8de5e3b517ce6b4bb14d4d3616ece0 SHA-1: ab782885d64d4c01182dfe0882606fae5674867f SHA-256: 4937e87cd98a10e6aeb7013eefa330203dd557228cc88567500dfea61fe8c678
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://jottigo.ru/aws?utm_term=horror+movies+2017++free+mp4 PDF link annotation
    • http://reduslim-shop.website/tofozhyrs9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375507/normal_5ff3f9048a62d.pdfIn PDF document text
    • https://kejazomunago.weebly.com/uploads/1/3/0/7/130776678/debusasedox.pdfIn PDF document text
    • https://nojasiputijaze.weebly.com/uploads/1/3/4/8/134869787/ed45670.pdfIn PDF document text
    • http://devgm.design/74675742769vklvf.pdfIn PDF document text
    • http://lifegirls.site/inference_worksheets_fifth_grades7rin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462985/normal_600fe80747a5f.pdfIn PDF document text
    • http://freefire-gifts.com/taptap_app_review4ry1v.pdfIn PDF document text
    • http://sovetnik53.ru/redigadabupez33iba.pdfIn PDF document text
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/3257202.pdfIn PDF document text
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/dadojutozov.pdfIn PDF document text
    • http://leaninrzpd.site/brahma_puranam_teluguvdv95.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/tozarujumofinu_waziwofofitofif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fewasav.rf.gd/rofizexem.pdfIn PDF document text
    • http://mawigugu.rf.gd/queen_bed_sheet_size_inches.pdfIn PDF document text
    • http://wuzuzifo.epizy.com/mailchimp_template_maker.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/38923906413.pdfIn PDF document text
    • http://simipibenafar.epizy.com/lugumavoko.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_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 5320 bytes
SHA-256: 314b435e983c5c0ac37414c76e6a0cc7e4af465b45e37c26f46b92475f08d405
font_01_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 10620 bytes
SHA-256: c0a82c8c669516eeff0f5378db481cdb6e25f215ed5e0f8eb04850df4ef6950a

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