Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf920727dc2e71e…

MALICIOUS

PDF

78.0 KB Created: 2021-05-08 01:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d750f742c0553147be9f82f661306d87 SHA-1: b178bb4f0865de3924069fa29e5aa61964cbdd81 SHA-256: daf920727dc2e71e6f65ff29982a712bb80e436e68b51ca53d7a1e4460e5fa16
186 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 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+change+the+battery+in+a+cateye PDF link annotation
    • https://vatozuserivowi.weebly.com/uploads/1/3/4/3/134385792/3462136.pdfIn PDF document text
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/c8e42305ad.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/4835994.pdfIn PDF document text
    • https://zesalogerevuj.weebly.com/uploads/1/3/4/6/134684883/velutusipajufegor.pdfIn PDF document text
    • https://fosiwiveputip.weebly.com/uploads/1/3/4/4/134455476/ditonewin_nifutemivufix_tepotas_mejufuko.pdfIn PDF document text
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/siduwiden.pdfIn PDF document text
    • https://siteketu.weebly.com/uploads/1/3/4/3/134362374/2152f2ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_384859efa6ba471cbe74bf175ae08113.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa423c93-8b0b-47c3-867c-e7ec97b198d5/85429915311.pdfIn PDF document text
    • https://82e7f058-9c2a-4352-8e65-a162d98cde11.filesusr.com/ugd/ba3c76_98fc8e1201a0496c887821957467bde5.pdf?index=trueIn PDF document text
    • https://de74b992-0de1-402f-a2cc-438209b178b2.filesusr.com/ugd/2693ef_eebb68fd765f41bb8f64dd42cf83ef1c.pdf?index=trueIn PDF document text
    • http://mudozegiviw.epizy.com/why_we_sing_kirk_franklin_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f829aefb-76a2-4530-b17d-dde5cf979c64/kazenujetajenoj.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_389f7a94b3284a149d9aaa7d95d4d4a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d4cddb-b347-4287-a5ea-1f5b2373b363/zumo_660_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfcb34ff-0d2e-45b1-971a-3f35508a56f1/vibudalomowononanixote.pdfIn PDF document text
    • http://datufubizut.rf.gd/20049514234.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_e31fab99b47141dfab6fdac54350f091.pdf?index=trueIn PDF document text
    • http://lavofedelozus.rf.gd/20023877352.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_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 5148 bytes
SHA-256: 1b5fac90bb1299dc1f6e470963fc357adf448ab5ba77e67cc8167ad6af4f709d
font_01_sfnt_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 11200 bytes
SHA-256: 23082798df76549b8b709f94dbe871dc6878863da6cf838bbe27d08f09a4f717

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