Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4eb1ef19c8e08c…

MALICIOUS

PDF

70.6 KB Created: 2021-03-25 15:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 478347e4967db5e20d138a687af38c6f SHA-1: 1a88cf878caabef139e8ac53d6d95a3a09167af6 SHA-256: cc4eb1ef19c8e08c5472b14650dd5a93b00c324b5ba3aee085a52200256e76c8
192 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, routes users through malicious redirector infrastructure 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
  • 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 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.
  • 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
  • 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://yafferge.ru/123?utm_term=bluetooth+driver+dell+latitude+e6510 In PDF document text
    • http://gumidaz.medianewsonline.com/22196275070.pdfIn PDF document text
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/worava-puririzex-vivemama.pdfIn PDF document text
    • https://cdn.sqhk.co/mejomusajob/agdjhs4/best_cotton_flannel_sheet_sets.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/active_and_passive_voice_rules_chart_download.pdfIn PDF document text
    • https://relazubaw.weebly.com/uploads/1/3/5/3/135315829/1f6474.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/9898fe4b0.pdfIn PDF document text
    • https://cdn.sqhk.co/mokopizel/hbhfi7B/real_cricket_20_download_for_pc_without_bluestacks.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/jdifghw/tefub.pdfIn PDF document text
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/joweb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5fc593c1c8dcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426545/normal_5fc5d8cd4aaaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_6017b2c925b99.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/hacxPhg/39723752670.pdfIn PDF document text
    • https://cdn.sqhk.co/zikonidenijo/vf0Fgg7/47557324581.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/hhiighj/chess_rules_extra_queen.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/iiibdif/jiwitazedogagikudazipub.pdfIn PDF document text
    • http://sanadewa.iblogger.org/83852790820.pdfIn PDF document text
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/zefenizefevu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supedir.epizy.com/fujomidimekipapumitupo.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/xavaw.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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 5316 bytes
SHA-256: fa471591867bacb1a9948e81b24490d63cd22c223437afd231d639d9dd446beb
font_01_sfnt_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 10548 bytes
SHA-256: 31c64903ebe75b912108d1bae457d0992dbc7240ae175f5385d4d97d858db0ac

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