Malicious PDF — malware analysis report

Static analysis result for SHA-256 17237853427cec9e…

MALICIOUS

PDF

70.5 KB Created: 2021-01-16 15:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f129516c8eb8f89a36b7ebfc5d13f7d5 SHA-1: 8f585d80e3227d68d68527a1d202f400d1b8d981 SHA-256: 17237853427cec9ea6105bcf31d515ae3dcd2bf6ec7e43fabe29e5bb7e13eccc
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 0.9997

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://trafftec.ru/aws?utm_term=example+apa+format+annotated+bibliography PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455405/normal_5ff65037d612e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415745/normal_5fd9e64f6fefa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489975/normal_5ff95f37bac0c.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/jilibojon.pdfIn PDF document text
    • https://kogavoduwesexup.weebly.com/uploads/1/3/4/6/134600755/5565951.pdfIn PDF document text
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/varuvakapani_giwuvobopogud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496146/normal_6002d17268db1.pdfIn PDF document text
    • https://gesoroserazam.weebly.com/uploads/1/3/4/3/134310447/zumimutokejife-vexepax-dapima-lubemofelux.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/eea472ac0d84d.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/sifawekujiki/renexofefaxugonozu.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/dasubapesoga.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/wedding_anniversary_photo_frames_free.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_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 5544 bytes
SHA-256: e8d7b987b101b06eca3e9ba1ed18fb7665c6e1b576ae9b5b41292cdb6f76ec03
font_01_sfnt_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 10836 bytes
SHA-256: cdbebd770d816aa007dcc4b059078371aa0eb888d06bf1ee4055f6961cc510dd

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