Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfb03c67e97c384…

MALICIOUS

PDF

84.3 KB Created: 2021-03-13 15:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 14619be6d3de1d2c4f863c1eac050c73 SHA-1: dfdbbb687c23cc2e7a250fd08f399359c76aca93 SHA-256: 4dfb03c67e97c384d813dad9fae63e11193fffea73b6c053ba7af77910c5045c
124 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `https://dafemum.ru/award?keyword=guggenheim+museum+bilbao+architecture+analysis+pdf`. The ML classifier also strongly indicated maliciousness. The document's structure and numerous links suggest it is part of a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=guggenheim+museum+bilbao+architecture+analysis+pdf In PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/hbaAlMw/fantasy_war_tactics_r_tier_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466165/normal_5feebb5dc99f0.pdfIn PDF document text
    • http://pisodanijuke.iblogger.org/57986260283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_602fc428f3607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408184/normal_5ff57a4f77e93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368488/normal_5fe065cd63426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424361/normal_6046e1ec1ea19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_60377a94caf4c.pdfIn PDF document text
    • https://pegupirorig.weebly.com/uploads/1/3/1/4/131406852/zakagu_xibirufufoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463551/normal_6019f09b23513.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/2gc4p8B/zixiwedunadokusegenuf.pdfIn PDF document text
    • https://xiluxobafuju.weebly.com/uploads/1/3/5/3/135323992/333281.pdfIn PDF document text
    • https://xuzopodoker.weebly.com/uploads/1/3/0/7/130738955/riwosakuvabix-reroxi-fenewidix-wujawufofo.pdfIn PDF document text
    • https://lewaxirilukuxod.weebly.com/uploads/1/3/0/8/130813115/polosunofifilosu.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/26e00ced-3de1-4d5c-9b86-817bfc3ef463/dapikatawunositaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d597e859-55e8-47b3-bf3e-c66325ee9eee/wudekeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9332fa-8eeb-43c6-96a2-8e9395deac2d/xipumedeb.pdfIn PDF document text
    • http://lupibewexuzu.rf.gd/bypass_icloud_activation_tool._zip_free_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8ec25f-b855-4522-a21f-a5635004cf01/john_deere_mowers_with_baggers.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_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 5840 bytes
SHA-256: 32fbb75ef4bb7b954fe41025788029b12e62cbe73f1be53544a03796c8b88ab1
font_01_sfnt_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 10592 bytes
SHA-256: 8feb802d568489f4e4d103fa5ba84bb8c4238f576be263d4cf0cee0b584ac60d

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