Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91419bddc95bcf5…

MALICIOUS

PDF

65.6 KB Created: 2021-01-06 19:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6639aae4fba8aa2730fe0c67a1c51b65 SHA-1: bc7c9eda0768cfd637be535a858630946068e4a5 SHA-256: a91419bddc95bcf585d6dd1068cc34bb268035fc54f2a01862110772c3ebd4f4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to a suspicious URL that appears to be part of a link farm or phishing campaign. The document body, though partially corrupted, suggests a lure related to 'logic gates exercises' to entice users to click on the embedded links.

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://trafficel.ru/123?utm_term=compuertas+logicas+pdf+ejercicios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5fc344de96634.pdfIn PDF document text
    • https://gunagejosiva.weebly.com/uploads/1/3/0/7/130738835/19e78a67702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_5fab9469aa2cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f875cafd038e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5fc7336e8e28a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5fdb1a3c9e649.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368745/normal_5fdfb1bbbb7c9.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/68145eb9-a990-4166-900b-ae62e9dd2f52/lined_seahorse_characteristics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63eb1cfd-e082-40d4-9916-b5d6fa565bb6/c_initialize_vector_in_constructor.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/namenawam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3918764f-4740-40d7-84a5-cbe673c4a4ab/80444725655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e3b480-8b32-47df-bcf1-0d51de5910d8/jologujivar.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_off0000ba5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5D 5456 bytes
SHA-256: 40d006a7a098433f7d3cb22c6fa0850214bd08aa98a3fddbe9a4aa0a1e7d7f2a
font_01_sfnt_off0000ccc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC9 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000d557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD557 10860 bytes
SHA-256: 594838a58cff9f676ff9385c5df9049a1ec3719a6dea0c32d8ab377e352190ff

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