Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0efdb10b0a52ea…

MALICIOUS

PDF

117.8 KB Created: 2021-05-19 13:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 04244d9fb498517bfb033cd2f10c966b SHA-1: 9e90ba4ae68daee8f404b308609ccd639bd1288f SHA-256: 8b0efdb10b0a52eab3d9519d6c5d1809d6b145940fa46bb4c8732dbc0b3af142
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 0.9998

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 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://dafemum.ru/strik?utm_term=algebra+1+chapter+8+practice+test+answers PDF link annotation
    • https://xepepewidejumu.weebly.com/uploads/1/3/4/6/134669023/0770b9be3996ef9.pdfIn PDF document text
    • https://guzudefadeberis.weebly.com/uploads/1/3/4/6/134639139/muxibonuw_kilakudag_pexitibanad_wolutejaxoti.pdfIn PDF document text
    • https://tawuvumiru.weebly.com/uploads/1/3/5/3/135326103/sorojesugitotovama.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/saxulifi_gexuga_tonevuvelape.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448357/normal_5ff6a73e91766.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/ropiserugek.pdfIn PDF document text
    • https://xabuwizadapipuw.weebly.com/uploads/1/3/4/3/134351583/vawitiwasixov.pdfIn PDF document text
    • https://pepakulal.weebly.com/uploads/1/3/4/8/134885681/0d7760413c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_60534e607b46e.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/586b19c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_6063eabd195ca.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/gajakelegeza/ocarina_of_time_n64_vs_gamecube_vs_3ds.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/calendar_template_free_june.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/89369513054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8508ae0-56cb-42d2-bf71-f1f50536c1a8/68414897106.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/vimebutefeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35b6132-a83f-4d00-b292-6afd58e8edd0/29967278385.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_off00018c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C64 5664 bytes
SHA-256: 11efd2f460d0e8fb671ad6fb855d1324e862e64a573e273eb5404749e3ddda8a
font_01_sfnt_off00019fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FB6 12328 bytes
SHA-256: 4122f4548849b067455f7a1854a547543a05a786879e8776e72b0e9885383e25

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