Malicious PDF — malware analysis report

Static analysis result for SHA-256 c836754202491d57…

MALICIOUS

PDF

77.1 KB Created: 2021-01-20 09:16:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d44af4ace39793dc081e8caf079bce5a SHA-1: e5807b72fd0b3cda3dd4dbd61121ffa5b3769d16 SHA-256: c836754202491d579c1ffc6f6f3721846b81e5cbbe52f8390648fe692bb31ee9
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it contains malicious content. It embeds numerous links, including one to a known malicious redirector, suggesting a phishing or malware distribution attempt. The presence of many external PDF links also points to a link farm strategy.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=drafting+hand+lettering+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4452199/normal_5fdf2c0c35b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f9bb71e9970b.pdfIn PDF document text
    • https://site-1174507.mozfiles.com/files/1174507/23395699041.pdfIn PDF document text
    • https://wojagezut.weebly.com/uploads/1/3/0/7/130775605/tozegevop-wirovejaxudav-dadezilorebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426059/normal_5fe58be7a2aee.pdfIn PDF document text
    • https://nifabixiguwo.weebly.com/uploads/1/3/5/2/135295020/sufosejuw-batokigubas-demute.pdfIn PDF document text
    • https://site-1172175.mozfiles.com/files/1172175/unemployment_weekly_claims_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5fc202523fa97.pdfIn PDF document text
    • https://site-1168136.mozfiles.com/files/1168136/adoption_application_form_a58.pdfIn PDF document text
    • https://riwetomawojok.weebly.com/uploads/1/3/4/5/134516188/puvidafulam.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/piwemasilix-tejevuxidifapud-misegeta-kanuwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423750/normal_5fce17369530b.pdfIn PDF document text
    • https://site-1179882.mozfiles.com/files/1179882/norajimesaxowuwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424981/normal_5fc7e58f4bc75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370299/normal_5fdeb2be1c921.pdfIn PDF document text
    • https://zujujogonawanuk.weebly.com/uploads/1/3/4/8/134879196/8785246.pdfIn PDF document text
    • https://zunitaxipef.weebly.com/uploads/1/3/1/3/131398356/3468860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_5fae6448f27ac.pdfIn PDF document text
    • https://mofaxogarapew.weebly.com/uploads/1/3/4/7/134771612/tegidepi_rogulonumaki_womivimukazem.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
    • 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_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 4760 bytes
SHA-256: dbd4d311d625b673b2b0bb4aeb5f6badbddba92d4f418d8a103d9c9fb05a34af
font_01_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 10392 bytes
SHA-256: 082564a87223a7e250702c02003e21c91dcb7ccad15aee974873e5ee05ea3b2e
font_02_sfnt_off00011917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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