Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7555fce5343757…

MALICIOUS

PDF

75.0 KB Created: 2021-05-12 22:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f3d5c35f61141a688bdccbf298a43ebc SHA-1: c344c00d29b629510fe4757d095f15bacccef413 SHA-256: de7555fce5343757571011e436fc99781a25e9c723aa261de092bbff0f3b7f82
164 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=how+to+program+avr+microcontroller+using+arduino PDF link annotation
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/fc2737584.pdfIn PDF document text
    • https://cdn.sqhk.co/bojodunaluko/nvgcgjt/46860255834.pdfIn PDF document text
    • https://tazojowilojema.weebly.com/uploads/1/3/1/4/131406386/5508353.pdfIn PDF document text
    • https://mumabawof.weebly.com/uploads/1/3/4/6/134634692/ligadodobelo.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/YNjg8Lv/70725296295.pdfIn PDF document text
    • https://cdn.sqhk.co/lixijadimit/JFGiarP/69501268357.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/bjhGggD/king_of_kicks_uk_review.pdfIn PDF document text
    • https://cdn.sqhk.co/sedasolegov/chajibm/free_html_email_templates_dreamweaver.pdfIn PDF document text
    • https://cdn.sqhk.co/genonitag/jdLP1Q0/venus_flytrap_for_sale.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/cc6f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6dd05bf8-a32e-4ce7-8057-9a1894012cff.filesusr.com/ugd/4ce960_d1e15d5b8560408d822bb87ed70f64aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezerawe/wofifigidurazofekijareso.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/kidaropadajunemovo.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/rupukisuzob.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/fuxopasuponuwisomeburavo.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_731a210ca8854355880615ee6b6ad726.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvazi/pezipigimepare.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/vuledoruserefosuwejaxoboz.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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 5504 bytes
SHA-256: 32bedb185c733ae10083b9ae61e9a65245ff3022fcb83afa44faa17f96f790b2
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 10996 bytes
SHA-256: 0cc7bacda007490677122900f26d9d4e904bc9a4ce479caba1a2fc10ecfdab97

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