Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26feedc96da4b86…

MALICIOUS

PDF

76.6 KB Created: 2020-12-31 04:43:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 40c86ee97686f9365f725b8d4f5bbf1b SHA-1: 274c95a370f8b12707fec28f071937dc50acc5e8 SHA-256: b26feedc96da4b86c1787865c01ad48e706bbaa1c3108a6c3a69853ac7967235
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, many pointing to disposable hosting or redirector services, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=random+fun+facts+about+cats In PDF document text
    • https://cdn.sqhk.co/pavujakorige/cVjfAxt/72820517804.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/gzhdugc/piano_lessons_youtube_blues.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/p5jjbgd/29778489032.pdfIn PDF document text
    • https://napumijuvof.weebly.com/uploads/1/3/4/7/134758185/7630791.pdfIn PDF document text
    • https://kupejuzog.weebly.com/uploads/1/3/1/6/131637034/wubupaziridinibu.pdfIn PDF document text
    • https://liwobolavus.weebly.com/uploads/1/3/4/1/134131542/4401845.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/AKyaPjb/pocket_stables_mod_medal.pdfIn PDF document text
    • https://bumopabir.weebly.com/uploads/1/3/4/6/134679094/6279899.pdfIn PDF document text
    • https://cdn.sqhk.co/zivugeri/gf55Mje/gazatenoz.pdfIn PDF document text
    • https://tujezagen.weebly.com/uploads/1/3/4/7/134775207/9464701.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xugigabitulu/28601786236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a22e787-c9f4-4786-9256-73b5400f8dc8/bad_lip_reading_state_of_the_union.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/ccrn_laura_gasparis.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/47345334337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b52538-2c27-443d-9dac-6ac33482287e/81894059548.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/getupux.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 4904 bytes
SHA-256: 84be1bdf2f6dc33f2ff0840ac097b66a707e1ce98fe776ec2c057f0d4b7a0fd0
font_01_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 10348 bytes
SHA-256: 771c4df6b84814320077c8024bed05d04df9e566d1fd2d21e58ecdf8fee3c3d7
font_02_sfnt_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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