Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bec5436ee17dce…

MALICIOUS

PDF

72.1 KB Created: 2020-11-17 06:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2e948e16f6792f9abba49f5c688d9fbf SHA-1: 258946c6030cdb88dc99cef9ea646dc6fb11c83e SHA-256: 63bec5436ee17dce5376b3e249ffad1e239180409116da6d8d6be8b224b1a5f5
214 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 routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=quest%25C3%25B5es+sobre+hegel In PDF document text
    • https://nipogoloduvi.weebly.com/uploads/1/3/4/3/134368022/vazevikarujesupawib.pdfIn PDF document text
    • https://wifusewaxoxuxi.weebly.com/uploads/1/3/4/4/134497844/nesikeregepe.pdfIn PDF document text
    • https://xikagarema.weebly.com/uploads/1/3/4/4/134489929/wejowodel_xaguwadame.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/2ae7b065dcac16.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/memul/somibugipupuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/rakezizaxerapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef4858e-53a1-45dc-bddf-59fe526aee4c/harlequin_blaze_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b5b9ca-0614-449b-be84-dd8086f6c047/genome_matt_ridley_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/81317913597.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/63110009851.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/next_to_of_course_god_america_i_shmoop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4bcbda5-263b-4860-833a-d5564af9906c/fodizokavuzisuwudo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 5156 bytes
SHA-256: 8ac94edff1528f2035dc92b7070e248002c3c39479ff2d71575c26d6469d3be6
font_01_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 2520 bytes
SHA-256: f8b5dfbd925ddeadaf140e1fd6cfa34134bf50ad26e18852ea5244b7b06bc956
font_02_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 12592 bytes
SHA-256: c769ef4592b6ef42105056f4d8baca3259ae4af619754b0b20bbf4b2262d5ffa

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