Malicious PDF — malware analysis report

Static analysis result for SHA-256 f727517eac6bbfcd…

MALICIOUS

PDF

66.8 KB Created: 2020-12-23 19:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 45dc0a4b372bdc4b62d3ba67ff73a432 SHA-1: b1db40f2af59ee4c70836ad406684a4796338608 SHA-256: f727517eac6bbfcde53ad471eee9ec0573ac70c68b3801d82e5f7a86ef0ba32f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

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 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://traffking.ru/123?utm_term=scharffen+berger+chocolate+maker+case+study+solution PDF link annotation
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/cac30a45.pdfIn PDF document text
    • https://cdn.sqhk.co/xobitabab/bPgggcC/67797743009.pdfIn PDF document text
    • https://cdn.sqhk.co/ludafojebi/FbMtjdq/chop_chop_slide_song_ubersetzung.pdfIn PDF document text
    • https://cdn.sqhk.co/wadumebe/HtzBgca/dasoperekekub.pdfIn PDF document text
    • https://cdn.sqhk.co/gopefovepagi/RPio59J/41629537552.pdfIn PDF document text
    • https://metubunotawe.weebly.com/uploads/1/3/4/5/134595280/64d80396569eec0.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/wumodukubaru/joduvudokafiwalujigilij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ec851f-ec48-4579-988a-82e79e6b3948/square_trade_settlement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25678a23-4b30-4500-9013-f96fad9a5c39/33997233555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37de3895-a8e3-40ac-a2a9-1aaf12866667/kotion_each_mic_not_working_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f26ef2c-8bd0-4ec8-9f1d-7eec652fde34/mewedolagaw.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_off0000c875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC875 5844 bytes
SHA-256: deec53da0af345dc21cb08abdb70629b6f5b30b073b6cbf9a64ca505da65ac70
font_01_sfnt_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 10016 bytes
SHA-256: 011ca70c95e475c8ccacb33a7520577c6e090c4476cb5259e09452d8c78c747a

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