Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e0fa5407113b24…

MALICIOUS

PDF

74.0 KB Created: 2020-12-03 10:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2076c23a302858f658cca1aecfdba177 SHA-1: d80894511ce05f83f2a46e6518b0f129dc201b85 SHA-256: b7e0fa5407113b249976856761e076f1f1e85ee8402d77561e69b3efaf2835c7
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 0.9997

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/strik?utm_term=download+keyboard+apk+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469126/normal_5fb28551e497a.pdfIn PDF document text
    • https://buxiwizekekaxe.weebly.com/uploads/1/3/4/6/134662233/kevonup_vumororunoju_worijogutorew_sikusorosowirex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_5faf0ff5e75a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_5f97f9cd6c6b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_5f98e07f7e959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_5fad7005e7c98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501791/normal_5fbce88238eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f92346a97694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_5f9fbe5feeac7.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/fosagobomap/71796033246.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/hr202_humidity_sensor_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/24944970369.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3A 5368 bytes
SHA-256: cb2400896af369e33f30ca6a830440191fdc832551ee0ee4825ef2448cc1f387
font_01_sfnt_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 10568 bytes
SHA-256: 4283afea4872a1923125060138cc9dbdcfdb83b23bb541b4893cbba4f3b156d6
font_02_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 16344 bytes
SHA-256: f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89

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