Malicious PDF — malware analysis report

Static analysis result for SHA-256 c885400aae10d3ab…

MALICIOUS

PDF

81.8 KB Created: 2021-02-17 23:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dabb248fa1312ba424cbfec387061340 SHA-1: d637bacda301721071b2ae8cbddc7009ac0a4d20 SHA-256: c885400aae10d3ab880239f2c5e8c6d94ffcdf5ebaa797a06d529b4a57cae55e
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://jacksth.ru/wix?keyword=carta+de+jamaica PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499995/normal_6022cd576e199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486534/normal_601ebf270dd90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_60244f7b74412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5fe6ea0f146ee.pdfIn PDF document text
    • https://cdn.sqhk.co/rigidaluta/hetDIhj/sunrace_12_speed_xd_cassette_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485568/normal_5fc749da3e3ff.pdfIn PDF document text
    • https://cdn.sqhk.co/vonezositixi/VhgVAhc/wilixifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_5fd7b6613f47e.pdfIn PDF document text
    • http://slamelina.website/whatsapp_for_nokia_e72_freexokid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366676/normal_5ffd46b24d4a8.pdfIn PDF document text
    • http://callipakk2.site/zuzagufasomilakoxedubekp43k.pdfIn PDF document text
    • https://cdn.sqhk.co/fekurisakez/jbgfzLB/88627209593.pdfIn PDF document text
    • http://cadenalia.com/international_debit_card_sbi_application_form8204r.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/jihjdgj/90702581176.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/jai_ho_tumhari_bajrangbali_video.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/gawat_janin_fetal_distress.pdfIn PDF document text
    • http://pamakejexo.epizy.com/makalah_parasitologi_cestoda.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/tawesuduxivon.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_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 4548 bytes
SHA-256: d77af7c7f7ea6ebacf81e22ce285e03b4c261c3ec3c85908e79a56c859a01477
font_01_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 10000 bytes
SHA-256: 44f087bc025289f5853d3c4a02d8a3ae302c816a54807336fcf9d72bf8e2c945
font_02_sfnt_off00012bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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