Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a904a3f79d957b…

MALICIOUS

PDF

66.2 KB Created: 2021-04-03 13:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7129fe9b7b52a20dfd46f8d692eb6305 SHA-1: c148fbc78b01d33d0f4c6162d8de60361b96e24f SHA-256: e8a904a3f79d957b131e6cb9fbed755af6faf0b8d72a92553cd775d2f8d457d8
186 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. 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.
  • 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://nipisod.ru/wix?keyword=compass+shipping+grenada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420743/normal_6039f8888c4d4.pdfIn PDF document text
    • https://cdn.sqhk.co/lazimafuxuxi/PghoidX/amaze_browser._cast_web_videos.pdfIn PDF document text
    • https://bupedokan.weebly.com/uploads/1/3/1/6/131607930/65aea.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/jbihaKr/stack_fall_3d_y8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411915/normal_5ff24801743ea.pdfIn PDF document text
    • https://cdn.sqhk.co/minutakumu/fLdxgib/hogwarts_acceptance_letter_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/pubabolab/gUdizO8/caller_tune_baby_song_video.pdfIn PDF document text
    • http://fibilif.iblogger.org/bionic_arm_template.pdfIn PDF document text
    • https://larofumizedewep.weebly.com/uploads/1/3/5/3/135326757/5884449.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/s9CpFjg/new_bollywood_ringtones_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/aahjgcb/men_s_fashion_guide_business_casual.pdfIn PDF document text
    • https://cdn.sqhk.co/lijumifi/djdIxZ1/cisco_firepower_ngfw_data_sheet.pdfIn PDF document text
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/lenusudufevozomuvad.pdfIn PDF document text
    • https://cdn.sqhk.co/fewisezux/jhCiehi/idle_slayer_bow.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/Lhcijhi/19516901143.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikosugurib.rf.gd/febomuwitavosufukubu.pdfIn PDF document text
    • http://buguteloseserup.epizy.com/93125570672.pdfIn PDF document text
    • http://bigefen.rf.gd/mobile_app_design_template_themeforest.pdfIn PDF document text
    • http://miviguwi.epizy.com/aptitude_test_papers_of_infosys_with_answers.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_off0000c588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC588 5244 bytes
SHA-256: 48f389638144fffc3975ed947056a537ca628f3040084726719a9ab7faf63ed8
font_01_sfnt_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 10704 bytes
SHA-256: 448202c18e2ad8744b2bdabafcb1848a3b2f8447d81b4eda94cea354e37d053e

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