Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11a78d2636575cf…

MALICIOUS

PDF

83.0 KB Created: 2021-03-09 07:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2040cc9d037735c8d32bf742621069f4 SHA-1: 9de3b8c29c61a4ee4c975ac1d09c16dce5117d0b SHA-256: b11a78d2636575cf6bb09addc9530baf60ca4583e165b6c367e331f2fd45f22d
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 0.9993

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 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/strik?utm_term=el+arte+de+la+guerra+resumen+por+cap%25C3%25ADtulos+ppt PDF link annotation
    • http://ighelperscenter.com/fuwinedutedakoresalodajefupin1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501495/normal_5fcbc505a5583.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/jghhjfN/divarication_of_recti_symptoms.pdfIn PDF document text
    • http://capridigi.com/27062370867hk05w.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/juxuvi-xudelikuwezit.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/emrighi/minecraft_zombie_apocalypse_mod_download_1._8.pdfIn PDF document text
    • http://fullhp.info/pasefabisuriniforadevoresxy34p.pdfIn PDF document text
    • https://rimibike.weebly.com/uploads/1/3/4/6/134636102/zijigozejijuvigap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466367/normal_5fe8931f886e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_601a0028a4c51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5fd89e98415f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_5fe64b212d29a.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/3e80d059247ea0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426410/normal_5ffe07f61ecee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466165/normal_5fd95e7f3041e.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/MhdOM96/9409310225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_6012789173659.pdfIn PDF document text
    • https://cdn.sqhk.co/duzixulok/ahgNOB3/lofudifexezuseluxejajovo.pdfIn PDF document text
    • http://lighterusb24.site/manly_p_hall_archive4bydf.pdfIn PDF document text
    • http://bestplacefor.rest/insignia_digital_to_analog_converter_box_manual3nujg.pdfIn PDF document text
    • https://bawusazatodopam.weebly.com/uploads/1/3/1/3/131378774/9263329.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd1177b5-bb34-4926-b4ab-56fa6284dcb6/painting_kitchen_cabinets_without_sanding_or_priming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb0d3d4-9d74-4e1a-8268-92821d30daec/adobe_audition_midi_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1db5a6f-b3bd-478d-9327-739f6b4f6b9f/78998815047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18252254-4f61-4bf3-9550-de94fa4375b6/kubla_khan_analysis_line_by_line.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_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 5404 bytes
SHA-256: c5ebafa0969f5b34b98f3eb63e1e6c9b9e5b0383d6dc0e3c0d9755096fd42b1e
font_01_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 11616 bytes
SHA-256: a80c5dad03a07dda9dd5fc424a01dca361eef82406f0c8e45cbbb7081c5e63b8

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