Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66d51bdd02f3e19…

MALICIOUS

PDF

75.1 KB Created: 2020-11-25 00:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f06a72fc440c5cd826b60d024ed93bc8 SHA-1: d82ecb1eec4e108c71170b4978e1af9d40532b7f SHA-256: a66d51bdd02f3e19608349738780f0a334b926fdccd86a2f3d413f557a402b3e
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://trafficel.ru/123?utm_term=locust+grove+middle+school+facebook PDF link annotation
    • https://kadogejajufa.weebly.com/uploads/1/3/4/7/134717900/kirunisijober.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_5fb6f01cc4a1c.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/4582192.pdfIn PDF document text
    • https://palarijebatexo.weebly.com/uploads/1/3/4/3/134338538/b0b8cdbab680b.pdfIn PDF document text
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/kanit.pdfIn PDF document text
    • https://jefapijuwenumik.weebly.com/uploads/1/3/4/4/134435530/kamesuzo_pedewununiw_muxubavele_sanewetif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5fa702e879f56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4ade4b-c215-413b-b4c0-dc6a31a69f1f/titimiwimovemitakisogis.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/sabimebo.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/fajedosoxuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/applied_physics_letters_ms_word_template.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/nimobuvakefibebed.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/33918595995.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/gagowanubipol.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_off0000d3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E9 5640 bytes
SHA-256: a14371e11e516bf85ca070f0bfa6eb455786bef7c9a59c0bf4b6951b0e37e7b9
font_01_sfnt_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 10344 bytes
SHA-256: c38e45e348ad768bba3b7a2075f87e1916912d548afbe4f1794d836c2db5f16a
font_02_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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