Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db3bd0a8d6c14c3…

MALICIOUS

PDF

74.8 KB Created: 2021-04-09 12:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c100757daafae55f376b2ffe782dcb7e SHA-1: 6b31103163fdaedd57c487577cfb8736adb229a3 SHA-256: 7db3bd0a8d6c14c3c0795977fa361ca301245bf9d4624f6e91b548a88ee38f01
186 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 0.9998

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://soxebez.ru/strik?utm_term=patriarcas+y+profetas+pdf+descargar PDF link annotation
    • http://importants.space/xisaxenumebetofarikevegygorq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417138/normal_5fe9b297d995a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372360/normal_5ffe796c77ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_6012a7906cc31.pdfIn PDF document text
    • http://citrus-fruit.space/46212370108prkjr.pdfIn PDF document text
    • http://laithub.pro/baby_jogger_city_mini_gt_travel_system_steel_grey1e1x0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_601ce8e9d695c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_dc9c5e9ef5b54d6f8ed37ca54db1385f.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_c8bc98e0f45c4f55ba965486832eae7b.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_15875425118e4454ac1a9e86b20dba72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazivemon/bevowaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63143d3-32c5-4ba3-8f61-0060674ee699/vusijisojukajipudatabip.pdfIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_a2f4ac06dbfc4281b69a3c7a777bc1b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/arewa_nishadi_android_app_here.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_e3eafc972e2d4556a6cda18e9f1aeeb7.pdf?index=trueIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_a3adb4e24cc04e80a2cddda03dbf7c93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f2910b-ce58-49a8-89be-a7afa9f2a1cf/dont_get_lost_in_the_sea_of_despair.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/32173484980.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_dcfac9db11be47439c3f37412dc015ae.pdf?index=trueIn 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_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 5392 bytes
SHA-256: 61892ccad87661bd25de01fca64e3de1d399ae622132705b62e92cede775056b
font_01_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 11984 bytes
SHA-256: 48fa910e2760702b7164c71629c1d3c2f9f579c97ca6cbe3d76e3414a509c50f

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