Malicious PDF — malware analysis report

Static analysis result for SHA-256 5828dab1e710e67f…

MALICIOUS

PDF

66.3 KB Created: 2021-03-20 00:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4ea224ec183b0c29689912ab1eb9c923 SHA-1: 95ca33e4399fe8961529c07f1f62bbd83d2ec2f3 SHA-256: 5828dab1e710e67f8ed2a2964ed5962eeeccec9fd6ba177551d8df0bcef148bd
156 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 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://jumiwimov.ru/wix?keyword=bill+nye+the+science+guy+buoyancy+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5ff67e8b8fb49.pdfIn PDF document text
    • https://ferofetilusef.weebly.com/uploads/1/3/5/3/135346026/tuweson-tesetax-mojizirovifine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384632/normal_5febc08a4d86a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451353/normal_6011dfdea1c03.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/chalcolithic_culture.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470689/normal_5fffa32e68f7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_5fe488acecb15.pdfIn PDF document text
    • https://luminesip.weebly.com/uploads/1/3/4/1/134108660/b9238a13fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_6010007a182a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_603d38a9bfa63.pdfIn PDF document text
    • https://wajupinafuju.weebly.com/uploads/1/3/4/7/134752356/3493ee4c79d5de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69b12d55-863e-458e-a545-ad358ed6bd1a.filesusr.com/ugd/a9642c_52ef56242ce9438db7ef410c45d1a4cb.pdf?index=trueIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_4913143060b841f5a1d7c2b3bfbff98d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6528d432-7ff3-42e8-9259-6152823cf45e/7610562155.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_a917eb14b35c4c5baf9f1aec619fe786.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8723a020-8d4e-40c7-9d3b-fa67c08ade57/yard_machines_parts.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_a8c527ea7dc04b318fa99fb3e677d4e4.pdf?index=trueIn PDF document text
    • http://pevogikuxupeja.onlinewebshop.net/javulom.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_off0000c382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC382 5508 bytes
SHA-256: 98cca317457e89c94f225fdb8e949414ff864c18ccf8267eed2d7c2e52118b01
font_01_sfnt_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 10640 bytes
SHA-256: 7a0036bf035efce2940e827eb69389e519437f8a3d683f70c3b7930ebc0c5068

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