Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6bc90c08bf665f…

MALICIOUS

PDF

69.5 KB Created: 2020-11-22 20:35:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3bc58c409ecf1f4a900b6327d83bd8b4 SHA-1: 9347a091ca9a1077d38aa83bc723db9f83e94b89 SHA-256: aa6bc90c08bf665fbb833dee7702bbf22949fc7148989e3c6448ad70da93ba5a
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://traffnew.ru/123?utm_term=what+is+your+culture+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5fa393024de72.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/5809249.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/7204304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_5fa322c5d1f1b.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/8001a4b7-ea07-4696-af74-dae7108a8964/bevijepotarutotosifutoles.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/kasunatorok.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/xagijefedujodujakopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f61ad3c-2bf3-40d7-b38e-ea6a5deb1bcd/liliz.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/asus_x502ca_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/eclipse_oxygen_free_for_java.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/kawokulamugi.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/22189788725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7117d842-9bcf-4587-a85f-1e3e86fda3b2/amar_ujala_epaper_shimla_downloa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb73b776-4ef3-4ba7-97ec-6dae222e0b64/its_getting_hot_in_here.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/chapter_7_gatsby_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1f0d52f-9543-4082-87a0-ae63461d09b4/wafidubux.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/fallout_4_nexus_mod_guide.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_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 5156 bytes
SHA-256: e89b4546cd138a7a7e236f19ffa5cfbf7e1fccb40a757aa2655d91da9ffe5241
font_01_sfnt_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 10364 bytes
SHA-256: 2c6a25123ee6aa806f1c601c539eabe55759fb1c7923d85843e10d1ebf4f7569

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