Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c2ac5922739971…

MALICIOUS

PDF

78.8 KB Created: 2021-03-19 19:00:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 859d48217f3f1e17206aff7e1d4cd821 SHA-1: 3dfc6d7f9a722afb1558cce24d82fbbe8ad88a37 SHA-256: 28c2ac59227399713e5332362df69f71e1f08ae5a0099a584c2c6e4ff7fb7030
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link to known malicious redirector infrastructure. The embedded URLs, particularly the one pointing to dafemum.ru, are highly suspicious and likely serve as the primary mechanism for delivering a malicious payload or leading users to a phishing site. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to lure users to external malicious content.

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
  • 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/wix?keyword=building+quadratic+equation+intercept+form+with+given+points In PDF document text
    • http://kowojolajamuv.getenjoyment.net/52110109273.pdfIn PDF document text
    • http://pegijegur.mygamesonline.org/39622623774.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/50947292045.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/zapelikozeziludurupo.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/9433415040.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/tecumseh_engine_identification_location.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/sikifaruzoxekojegudobomo.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/79113609490.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/likubivebovamoben.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/13a5b9ac-382e-4baa-9340-9f8f482535fe/julius_caesar_shakespeare_play_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a302b632-1f3d-4093-b9d3-7de0aa3b5897/meguxadiwu.pdfIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_eb76d2078bd14ab58e608ce1a9a361b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2107a0fd-4f1a-40ad-ae61-5cedd65ef42d/86044636968.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_46f53565e3da45a0acdb9a3c442a4286.pdf?index=trueIn PDF document text
    • http://bumurulepowele.myartsonline.com/46436126219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc6223d-8557-46de-867e-3099f61d2bf0/how_to_eat_keto_at_el_pollo_loco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5cbbc2-3fff-4be3-95b1-0a048e694684/rekububetetam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f506567-1627-41a3-8805-8b1da90b670e/navy_pregnancy_prt_policy.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_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 5896 bytes
SHA-256: d899335ec25a168fe4f5a14895ba1ca0e6e900ea01049579c50b8b41fcf7a6a6
font_01_sfnt_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 11592 bytes
SHA-256: 76de5c87265622e4363d31216a93ad6f969009e334319442d3170b78d78976a9

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