Malicious PDF — malware analysis report

Static analysis result for SHA-256 09159cc05bba135f…

MALICIOUS

PDF

68.4 KB Created: 2020-12-14 01:00:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d6065eb14c7c6e805269d476f0b20ea3 SHA-1: 685083a52dfe2fc4955b73bee72ac4f2c41982af SHA-256: 09159cc05bba135f69346fe84fd515ed242d7af7b456749f2effbd0313d9c0f6
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 link farm with numerous external links, many pointing to benign PDFs, but one critical link to 'traffset.ru' which is likely malicious. The ML classifier and ClamAV also flagged this PDF as malicious, indicating it's designed to phish or deliver a payload. The document body, though heavily obfuscated, contains text related to searching for 'joker online free google drive', suggesting a lure to a malicious site.

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://traffset.ru/strik?utm_term=watch+joker+online+free+google+drive PDF link annotation
    • https://nokajaxupi.weebly.com/uploads/1/3/4/7/134715681/8451585.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/fuliduwumipune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450636/normal_5fb9faf7396d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415748/normal_5fa6a45833c46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/bronchopneumonia_in_pediatrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35297229-69ba-48bc-b25b-3a138ed27164/tatawidodogenij.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcecfc5efaa704a0f58b666/t/5fd60366c4373837b900c855/1607861095612/39356784424.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55e3d239b0722914f125b/t/5fc8532f8bd77935674d8487/1606964015598/34474170535.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe071a173fb5383b68e3a7/1606289181834/tyrones_unblocked_games_qwop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc066bd9955c744b5390948/t/5fd082aca4b4ef2db6a7753d/1607500460343/povurabivapumipegi.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/29455227079.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC463 5104 bytes
SHA-256: 1d7fe5044eb94b336f867e5fa6304e65e649757c410c1e50ffd443de04148747
font_01_sfnt_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 9712 bytes
SHA-256: 5379462f962ed2cfac5e85a5c882c7956b79c820c4808dd4e6adbb816d6a4334
font_02_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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