Malicious PDF — malware analysis report

Static analysis result for SHA-256 de83c28d19462ad9…

MALICIOUS

PDF

89.1 KB Created: 2021-03-09 20:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 119e84ba310a610228f9b7f58d212db4 SHA-1: 1d2b6af925b0c0563f1584ef7ad905e29e3a1756 SHA-256: de83c28d19462ad9a5aa6a2152db24ebe849f27c60338a53d45479a8db079b3b
156 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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crophysi.ru/123?utm_term=aptitude+test+questions+papers+with+answers.+pdf PDF link annotation
    • https://cdn.sqhk.co/luwesefizi/dSghqhf/74724981147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_5fd912178ee64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496853/normal_5ff3861548390.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/Mifliai/17183454008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465010/normal_60351b115f78c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369657/normal_603bbb13d1e27.pdfIn PDF document text
    • https://cdn.sqhk.co/sudizatase/hhhaidL/38905126944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453328/normal_601f992ad1f53.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/TNEhciS/spin_blade_2_mod_apk.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/zidosozawok/67794522596.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/how_to_use_vanderbilt_assessment_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/beyond_biocentrism_free.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_6d6f1ff461694ebdbafa344e731634f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/54976521858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ec4fb3-dde4-422d-a635-665695e4ec39/tabla_de_equivalencias_de_unidades_elctricas.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/zobevuguvi.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_4f87832bf0634f44840a619ae934cb45.pdf?index=trueIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_fd0396f2ecce410c8698116a04a67edb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/infinity_pool_design_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/feriados_puerto_rico_2020_oatrh.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_52ba9edfabcc45eaa171f9aeea7aefaa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb621b1-b4e2-4e88-b7b4-881bca64fb85/xobawenelura.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_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 5216 bytes
SHA-256: a28d0135f6062043a8b1185f08ec49569f543f7efe6da81a0927153b64e5cb80
font_01_sfnt_off0001240f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240F 10648 bytes
SHA-256: 82d15b68ba69aa07df8b10769f450d5be7599c160d6c48b5cc900f22ce4004aa
font_02_sfnt_off0001480b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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