Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e1ed5583f14c11…

MALICIOUS

PDF

69.7 KB Created: 2021-06-12 11:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7ca696d948f6d083feae437d74770f5c SHA-1: e15bf5719f71acd347fae65d52e6f4e629bb4180 SHA-256: e5e1ed5583f14c11cb0c4f0812163025492f6eaf770d4f01c844a69920b45b6a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to external sites. The primary malicious URL identified is https://inwebjor.ru/pbw?utm_term=sslc+key+answer+2020, which is likely used to host phishing content or distribute further malware.

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://inwebjor.ru/pbw?utm_term=sslc+key+answer+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487382/normal_60b9dc1191c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463308/normal_6027bcb1168e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446161/normal_6041dc8ada67d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8525bd4-bddd-45ad-b00f-9be2515efe2b/71997314542.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/how_to_hack_quizizz_private.pdfIn PDF document text
    • http://litorabi.pbworks.com/w/file/fetch/144781917/zarusafako.pdfIn PDF document text
    • http://patimedudemu.pbworks.com/f/koxivulil.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/w/file/fetch/144774105/kendini_anlatan_kompozisyon_rnek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109e8cad-715f-4a03-9786-b8be78ddff16/take_two_tablets_by_mouth_daily_means.pdfIn PDF document text
    • http://wizepexu.pbworks.com/f/perdida_de_carga_conducto_rectangular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c82a9aad-f5a3-4aa3-a987-0c2a508819cd/vedirisomewebugesinulev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cfd5bd9-1746-4ab5-951a-87c1c94a9c5e/mr._coffee_iced_tea_maker_at_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e579cf24-7e8e-4193-aa89-3836efbb5dbe/monster_hunter_illustrations_3.pdfIn PDF document text
    • http://tijigika.pbworks.com/w/file/fetch/145178946/the_cat_korean_movie.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/f/5856570228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7786edca-7241-42ea-8725-3186c9d9d31a/what_is_the_molecular_shape_of_sicl4.pdfIn PDF document text
    • http://nagaxop.pbworks.com/w/file/fetch/144811260/free_download_roms_for_ppsspp_gold.pdfIn PDF document text
    • http://mosijiv.pbworks.com/f/duvulumar.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_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 5428 bytes
SHA-256: 74f2bb6e8c1df29a41c4edf592ef03567aa38543158fbf1613fe480e33135f3a
font_01_sfnt_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 10840 bytes
SHA-256: 2b33587f89c977d2308777c052d079af1e45f28927da62474e26a24728ad0798

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