Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad244c6281b18cfa…

MALICIOUS

PDF

74.4 KB Created: 2021-04-04 17:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3b81a72030a1a2d4a25500d84e9a5dc4 SHA-1: e9fa3cd8ae0a7f4a1897002cdb46c030c107e247 SHA-256: ad244c6281b18cfa537ad98cce07eb02c6466cfb9afad1b1336e22603bc10162
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://xezojetit.ru/aws?utm_term=11%252B+verbal+reasoning+practice+papers+free+with+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479675/normal_5fdfa9460dba9.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/jbiisQc/dns_switch_unlock_region_restrict_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5ffa1a32a7b95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382962/normal_60069d1f5a78d.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/vovovege.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/22666729656.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/gfBH1hi/24522830881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_6037267cc4221.pdfIn PDF document text
    • http://kagutakonupana.iblogger.org/crystal_reports_database_vendor_code_1017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_16ff9ca408cc4092ba7e62550e2667e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/30380291329.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/android_games_on_pc_no_emulator.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/wejobifogosozexumujoxe.pdfIn PDF document text
    • http://polabufu.myartsonline.com/letter_b_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/compaq_presario_cq5700f.pdfIn PDF document text
    • http://gigoxasogoteje.epizy.com/what_is_the_fifth_step_of_aa.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_8cfa8f6bd6f646d29e9a98f8e2efa5f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/sql_server_2016_free.pdfIn PDF document text
    • http://doboroguvenuv.epizy.com/42237742714.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_a2e3e1d7e9f74f78b527cac3eb96d5cc.pdf?index=trueIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_87569e53df7d4ee18d45a6e6144862fc.pdf?index=trueIn 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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 5528 bytes
SHA-256: 69a733f7ea0f779373594ad20dc0a8889651b40a46a8a44be4edbd84cf6c40a7
font_01_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 10240 bytes
SHA-256: 315891975380d7f97566efe50039a6627af895467b84e05a878b037fe3347c24

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