Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a12f72b90b806e7…

MALICIOUS

PDF

118.3 KB Created: 2021-04-02 04:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 37356f6c0f7438b9de1bb2638c20beb1 SHA-1: 71cde8af37ed602956fe0136dcbaeb399f8aeb76 SHA-256: 0a12f72b90b806e702eb4c5b0b5cd802bebd553aaf35e675db3c956064634022
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, specifically a fake invoice or payment request, as indicated by the 'SE_INVOICE_LURE' heuristic. It contains a significant number of external links, many hosted on disposable domains, suggesting an attempt to direct users to malicious content or download sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing malware or facilitating phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pelibifir.ru/wix?keyword=vault+premium+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382408/normal_6037542d17adc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_60620581897d9.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/nemagin-bagefegiziwipe-dofidoku.pdfIn PDF document text
    • https://ribigitapupag.weebly.com/uploads/1/3/4/8/134887221/sixerariji.pdfIn PDF document text
    • https://gerukule.weebly.com/uploads/1/3/1/6/131606739/1994329.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/bba12d860d374b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_5fd852786f445.pdfIn PDF document text
    • http://idealslimitaly-official.site/how_to_repair_ryobi_battery_chargerbj0bo.pdfIn PDF document text
    • https://xaniwunedevivat.weebly.com/uploads/1/3/4/4/134470123/kumuvupoxama.pdfIn PDF document text
    • https://pamezupiv.weebly.com/uploads/1/3/0/7/130775156/tirubuwusepe-dosorezud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5fd17cb3ce6ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411917/normal_600744687279a.pdfIn PDF document text
    • http://drnextact.xyz/is_omnisphere_2_worth_it3fdsy.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/b2abc047-b1df-4c1c-b8c2-0cf57b15057d/70379364890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b185e5a-a0b6-4b83-848a-7a418ca1e15b/34667866226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e37fdb-7fbc-440d-a235-e97686d3754e/65959637052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b215fbd2-602d-4bbd-a432-b8bf7a543e0e/1134110603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2b5af1-5af1-4ed0-9dd3-c26ea92146d0/92421854873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452e46fb-538c-45cc-bfaa-7930ad658213/1017647456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc0f501-8321-44db-aa72-8903e8140121/2013_dodge_charger_srt8_super_bee_1_4_mile.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_off000125fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 34224 bytes
SHA-256: b7553957b2332c228cb9c6d40ab8083f2873d606a334017a5c9b72c85af8266a
font_01_sfnt_off00019017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19017 4816 bytes
SHA-256: 2b9a36a23ce343687eb452d7a73ad2f48a315c375116fc7ec731c88251c6e5c6
font_02_sfnt_off0001a069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A069 12448 bytes
SHA-256: f89e5217edbd521a2b0636179d0b07a0f3f32386ed036eae60d87e25ced2bd4f

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