Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfc566d3bc3b4f1…

MALICIOUS

PDF

40.4 KB Created: 2020-11-05 23:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a1ba3115beb383a34b33c6251c01f3df SHA-1: c91d7f17cd0121b0ca2ee3b1dd66c9d527d8a004 SHA-256: bcfc566d3bc3b4f13692dfa4cb656ac7776eb855f92334430b97920cc0659fb9
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://trafficel.ru/123?keyword=graco+ready2grow+lx+stroller, is flagged as unknown reputation. While no scripts were explicitly extracted, the nature of the PDF and the presence of numerous external links indicate a potential attempt to direct users to malicious or deceptive content, possibly as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://trafficel.ru/123?keyword=graco+ready2grow+lx+stroller PDF link annotation
    • https://xezinazilasiza.weebly.com/uploads/1/3/4/3/134319357/silusumonomelub-fonulenimime-rewojode-japarinepopot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5f8c0426ae416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5fa05c0da3a54.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nowawi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rorives/budesonide_formoterol_mdi.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/93589227328.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/19543042560.pdfIn PDF document text
    • https://s3.amazonaws.com/pojojagajevuxa/que_es_volumen_molar_en_quimica.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/sample_mba_recommendation_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2c5c17-b401-401f-ba38-5093d9fbd366/proyeccion_plana_o_acimutal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50fae89c-ef41-40f2-a2e0-fe6a8d478432/real_event_ocd_cheating.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/download_hangouts_app_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/mega_man_7_weakness_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4466d964-cd6a-4eea-b5c2-768562332426/jogakufop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d33c71-ca42-483c-8d3f-b310d6331b10/fubipojuwe.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_off00005f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F14 5532 bytes
SHA-256: 9c36ae359a6800a8b9eb1a67568cd0659a9dbaf57350e7a54eba7593d9943692
font_01_sfnt_off00007210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7210 9780 bytes
SHA-256: c4d6cfd0f0cdb6ac092792a4213df83d25ade54250122480145cbaf64d730643

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