Malicious PDF — malware analysis report

Static analysis result for SHA-256 677c49ea8009ed77…

MALICIOUS

PDF

76.7 KB Created: 2021-06-07 13:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f0b5b206e2688cdfa12151e7104904d3 SHA-1: 52e46380f35d8f52146ae020d9e67953bb02bb28 SHA-256: 677c49ea8009ed7703527e2665f67cd8962a128f373e02715d86fa44a2b39a1c
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 0.9998

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 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://zajinet.ru/123?utm_term=free+wanted+poster+template+for+students PDF link annotation
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/00230cffdd5c.pdfIn PDF document text
    • https://pimanubidaw.weebly.com/uploads/1/3/4/3/134353005/165143.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/vukidufigan_dujedilagi_jekinodat.pdfIn PDF document text
    • https://rodifeganugupi.weebly.com/uploads/1/3/2/8/132815003/tovorowe_janeveburevawan.pdfIn PDF document text
    • https://kebotufu.weebly.com/uploads/1/3/4/7/134735966/a67555af8b.pdfIn PDF document text
    • https://wemezixogasowed.weebly.com/uploads/1/3/1/6/131637562/vegobojakoma-dubifemux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_60483fa8da00e.pdfIn PDF document text
    • https://juwopivevonu.weebly.com/uploads/1/3/4/6/134682880/3719102.pdfIn PDF document text
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/8a87a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_6027b34a19a84.pdfIn PDF document text
    • https://begobaxu.weebly.com/uploads/1/3/5/3/135336669/wegedigilimewola.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389568/normal_5fcc7641a087d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4388596/normal_60b5a66e12d1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_5fd78679bc104.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/7e3482ce-7453-4a49-a54f-65e05022ff98/93997263600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a511311-7671-495f-abd0-310a6c767034/91327542207.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/a_que_se_debe_el_dolor_en_la_cadera.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/f/rojuzofepivobakuleded.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_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 5232 bytes
SHA-256: 6caef743990489c8bc7a2acf7009bc7e61adeb0b4d32846b954825bfe8fba556
font_01_sfnt_off00010013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10013 10960 bytes
SHA-256: ec7cb6f016905aa860dd134fe0993f89c171b252c822f9985570fa038505365e

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