Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aac21ac8ccad62e…

MALICIOUS

PDF

78.6 KB Created: 2021-03-22 21:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cb9bae2d7b130e1680d7d4157b7c3209 SHA-1: 1f6da613014e02dc53e5c2235e93c7c9bab564ed SHA-256: 8aac21ac8ccad62ea23121902a67bc6a7d3c2a7ebac2f627d37b001df02995c3
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=math+2413+utd+syllabus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388165/normal_603eb69920a96.pdfIn PDF document text
    • http://cashbackk.site/96489949410ghqgl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5fca91533e446.pdfIn PDF document text
    • http://gaydating.world/94945940311ll7am.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_602e669e716b7.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/paxivogedewilu/witekubeximerolu.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/65124171211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471632a5-62a6-4c53-a165-1cbee69182d3/green_eggs_and_ham_read_aloud_animated.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/genie_pro_max_not_closing.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/i_am_barbie_girl_song_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/maritime_accident_report_sample_letter.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_94a18dd84021414aa01e0fbb776c6b8b.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_152b5449edce41b1a5c2ce9f8fd96506.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/lean_techniques_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33cdd72b-0269-4caf-8da3-07f6dd140ad8/what_is_management_business_operation.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/lagevoziv.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_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 5500 bytes
SHA-256: 5f76ba7a164864225738d3ff6bf27a962ea99ab5275d62b9155a29afdffa4ad0
font_01_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 11184 bytes
SHA-256: 5b3a8831b554d5aafabf7cf2824eb92b521c4ec25cb2a004299927c3156202d8

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