Malicious PDF — malware analysis report

Static analysis result for SHA-256 406243fe98731109…

MALICIOUS

PDF

77.5 KB Created: 2021-06-09 09:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ec12aa9cbc07082b63ec1b9ebe357e81 SHA-1: 2f7e2c7b6cc059c17e55e9d49b504e55a134891d SHA-256: 406243fe98731109ea935deee7ca3d0a81e91696a1277f7ffd3d4bdb36f81f1e
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/pbw?utm_term=hill+climb+racing+2+unlimited+money+and+gems PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4403823/normal_60b1c81ba729a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_6023b4353e283.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fcbd4103323c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425929/normal_6003089723cd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5fe296ea61346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_60472fd2b5306.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/6935238.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413713/normal_5ffe886a7dacd.pdfIn PDF document text
    • https://tozowibalap.weebly.com/uploads/1/3/4/3/134383498/xiwujax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450242/normal_602e649c2e3ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470962/normal_60690aeff33f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475580/normal_60377c72f17c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388818/normal_600946d56c09a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_6036f2835c92d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pupowivala.pbworks.com/w/file/fetch/144803460/31535463942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2b503f-4b4d-4e50-b5a5-de9df67a88a4/wumare.pdfIn PDF document text
    • http://gonikob.pbworks.com/f/70170619662.pdfIn PDF document text
    • http://katexawa.pbworks.com/f/th9_bases_2020__5000____Low__0.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/what_is_the_best_translation_of_the_catholic_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb434464-2aa6-472f-9be4-a48f625d1bd3/20292541034.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_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 5592 bytes
SHA-256: 766eb48a41130af46f2c3ea19e39d03431ae241edacac4ebdce4a92c5aa58fbf
font_01_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 10832 bytes
SHA-256: 5045c93ad372fc299f9336f6824da0edce2472acaf294f3ce7191f2c5c428f29

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