Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7312c2e2f05ab9e…

MALICIOUS

PDF

73.9 KB Created: 2021-02-20 17:37:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 48a1205e44434f620b1835c20c6fbdda SHA-1: 5d0c8f9567c20233dab67a5f6ae2e09b6d570324 SHA-256: b7312c2e2f05ab9e3da1e595dfbedb500b6d6df21ad6fa1d303f26d2c17872f7
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

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://maypoin.ru/wix?keyword=glaive+prime+build+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fff5e35d2e70.pdfIn PDF document text
    • http://lukanovetefitef.22web.org/figure_of_speech_worksheets_7th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/lesebonun/6UMihji/best_buy_customer_service_pin_survey.pdfIn PDF document text
    • http://zootime.store/ado_net_tutorial7awy2.pdfIn PDF document text
    • https://cdn.sqhk.co/semobisugigi/pgjJHhf/85907967531.pdfIn PDF document text
    • https://cdn.sqhk.co/josedinis/jaehfgi/hide_and_drink_catchall.pdfIn PDF document text
    • http://app-3null.com/death_anniversary_invitation_templatexf2s4.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/AQiddgf/snack_video_lite_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413712/normal_5fe393ae568a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5fda49b4618af.pdfIn PDF document text
    • http://kafemefiturokuk.22web.org/acneiform_eruptions_corticosteroids.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kegepedefaripi.epizy.com/91355890214.pdfIn PDF document text
    • http://gunijeru.rf.gd/impossible_quiz_book_chapter_1_answer_5.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_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 5640 bytes
SHA-256: 85e6da8767b706099f0274883768faeb6b04b360e5885336d540874d90967bb8
font_01_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 10408 bytes
SHA-256: 4f1c84edef527f8a1b0fc46ea04ca99705aab84a80addb5e36dddbf96c5902a5

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