Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbe6f91931668a8…

MALICIOUS

PDF

109.3 KB Created: 2021-04-07 15:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3a3d71f2895fd0d7a33a83776ab5e0b0 SHA-1: df83c38aa3ee57a5427f4375756e7f4bd665c52e SHA-256: acbe6f91931668a806f4bc6976c17147f7395a189a25fc73f0e61618cdf9e2b1
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://crophysi.ru/wix?keyword=moving+straight+ahead+unit+test+answer+key PDF link annotation
    • http://losmopaka.site/brian_carn_gayf3jr1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_60130568bd8ee.pdfIn PDF document text
    • https://cdn.sqhk.co/mazinenik/g3ia2DI/mofexuderazeki.pdfIn PDF document text
    • http://italylife.pro/nonprofit_board_of_directors_job_descriptiony6e14.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/JDjgG8v/horse_games_online_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456379/normal_5fed4a63a9068.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/1925374.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/Xhcjhjj/fudegowotasijevexeriwuvam.pdfIn PDF document text
    • https://kafazuvowimi.weebly.com/uploads/1/3/4/7/134705673/1d8b6b18fc0ef.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/ggma6fY/67539790902.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/geidErr/pexemepowewiposijem.pdfIn PDF document text
    • https://jitugexe.weebly.com/uploads/1/3/0/9/130969989/rufiroximiwofetu.pdfIn PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/medarozurapeko.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/gixawetopoli/7220856513.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/mixed_addition_and_subtraction_worksheets_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/generic_facsimile_cover_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/adiemus_karl_jenkins.pdfIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_d917b0126b1f4796b450c7414e3bde52.pdf?index=trueIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_c669c5d8c2c44dfaa5fbcc3641c1421c.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E63 5380 bytes
SHA-256: d953e15a00b0b8daa34b3bbd64bf503c9f5a5c94d92b037b0368d7e7d96184ab
font_01_sfnt_off000180d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180D3 11408 bytes
SHA-256: 9cd480ce2b6af478773e42240b3880704c78ef5b2dd95508b1d3e9e013efe439

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