Malicious PDF — malware analysis report

Static analysis result for SHA-256 f758e48de873544d…

MALICIOUS

PDF

83.1 KB Created: 2021-03-01 08:30:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e8f8a4d49856476e45618fb50f22f1eb SHA-1: 65180bd7772900d077b5add4ccbdf1da02476250 SHA-256: f758e48de873544d5204e0f6473dafa9f824d2a95903fbd5a9be845c13c7d2ef
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a link farm containing numerous external URLs. The ML classifier and ClamAV also identified it as malicious. The presence of embedded URLs and the structure suggest an attempt to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

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 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.
  • 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://gimoguvi.ru/award?keyword=stihl+034+av+price+new PDF link annotation
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/mogafutolex.pdfIn PDF document text
    • http://bigojojodun.iblogger.org/latest_cpr_guidelines_australia.pdfIn PDF document text
    • https://jupoxoguji.weebly.com/uploads/1/3/4/0/134097256/lapaxizev.pdfIn PDF document text
    • http://mukosejak.iblogger.org/rule_based_thinking_autism.pdfIn PDF document text
    • https://jabukosiw.weebly.com/uploads/1/3/0/8/130874379/bedos_kekokel.pdfIn PDF document text
    • https://rasetakewalufil.weebly.com/uploads/1/3/6/0/136086978/3658142.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/f5f7b.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/4536450.pdfIn PDF document text
    • http://2020coupons.info/curd_and_cover_philosophy_of_science_the_central_issuesu6jag.pdfIn PDF document text
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/zilugenu.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/0961a.pdfIn PDF document text
    • http://workbykoder.xyz/hp_laserjet_1536dnf_mfp_error_codesy914g.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/pizivurapab/play_store_update.pdfIn PDF document text
    • http://beluguliwiwe.epizy.com/savatibuzuxuxazunaj.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/ipcc_2006_report.pdfIn PDF document text
    • http://divogidiguxofib.epizy.com/vitobiruzedemixefixaw.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/vuxorivunomuk.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/39616100147.pdfIn PDF document text
    • http://laxojidosap.epizy.com/jurefebemebibit.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 5492 bytes
SHA-256: 6efe8b14f683e54e8d4515b2e51fc42077238026e60240a0c3f148022526c7c3
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 12376 bytes
SHA-256: 0580c4406e4adaa0277d1ebad73aaeea5c74e50ef95fbf2875a369cf8fa74be5
font_02_sfnt_off0001298a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298A 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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