Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71a833a368834fb…

MALICIOUS

PDF

70.1 KB Created: 2021-03-03 22:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fe5861009ce6f00fef051d9bb3c4595d SHA-1: 6b5ae892a766e406bcb578d81f9ebea7ced6e78d SHA-256: d71a833a368834fb21992a0821792c72670908ca4f980f15255801c67b396d65
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to contain keywords related to job inquiries, suggesting a lure to a phishing or malware distribution site. No scripts were extracted, but the high number of external links indicates a strong intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/award?keyword=how+much+does+a+restaurant+general+manager+make+in+california PDF link annotation
    • http://najapizarut.22web.org/v_i_j_a_y_wallpaper.pdfIn PDF document text
    • http://gomededow.22web.org/civics_ncert_answers_class_10th.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/geCje83/amaze_tv_apk.pdfIn PDF document text
    • http://bigakeka.iblogger.org/ionic_generate_apk_play_store.pdfIn PDF document text
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/ranakoruvawexavon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480756/normal_5fcecfa56a947.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/farumajusukirefupuve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485012/normal_5fe14f103ff38.pdfIn PDF document text
    • http://pakabixi.22web.org/fixalogirizefokigukixifi.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/wunud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422390/normal_6029e16490cb2.pdfIn PDF document text
    • http://wegubutiwamaf.22web.org/remington_700_laminated_stock_boyds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_5fe745b6b563c.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/glU3jil/91020164472.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/9130621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_600f41d49b9ec.pdfIn PDF document text
    • http://dibuxovowo.iblogger.org/3081720953.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvegebufu.epizy.com/diy_bead_roller_sheet_metal.pdfIn PDF document text
    • http://bekelogamaju.rf.gd/kubipe.pdfIn PDF document text
    • http://diruben.rf.gd/pixefos.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_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 5552 bytes
SHA-256: 1fd63945c92d7302c079a447245e946c4e09c1e73324e25e252d3a8329d63e03
font_01_sfnt_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 10596 bytes
SHA-256: c3546bbed3987019a704b405288c029e88b9f4e2a043977b4c683c5fee078c91

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