Malicious PDF — malware analysis report

Static analysis result for SHA-256 4582881caafb1ebd…

MALICIOUS

PDF

71.7 KB Created: 2021-06-08 10:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6d6280079960571414d26698619ad095 SHA-1: 0508013d761fa7447c14cbeb7f6fd81d70295445 SHA-256: 4582881caafb1ebd26faa40781debb5c497e76442070636eb4d13fcbc7902b89
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect users to malicious sites for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/pbw?utm_term=baixar+corel+draw+portable+gratis PDF link annotation
    • https://vonosupaxeme.weebly.com/uploads/1/3/0/7/130740497/5906942.pdfIn PDF document text
    • https://nurerimufiwovu.weebly.com/uploads/1/3/4/3/134394752/veligefugakapenuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_5fe655c5008c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_60205eb4164ea.pdfIn PDF document text
    • https://vemisalisak.weebly.com/uploads/1/3/1/4/131437925/2435718b2813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_60497cfa34c32.pdfIn PDF document text
    • https://bifurizikekoson.weebly.com/uploads/1/3/4/6/134690439/1424999.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387036/normal_5ffb68c5c1a1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144701979/14299189349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb894ad-6dc1-4feb-bc07-b635dbc2d260/what_is_the_trichromatic_color_theory.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/w/file/fetch/144852885/tadafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/098a1a08-8fde-48ea-b916-12456e02a0fd/tefozemalafekuvomusotavaz.pdfIn PDF document text
    • http://sovafiben.pbworks.com/w/file/fetch/144543438/addition_reaction_of_aldehyde_and_ketone_with_hcn.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/f/order_ged_book_online.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/72622899120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c353eaea-4062-436b-be9a-8b8250ac6885/sda_church_texas.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144411717/98229552470.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_off0000d4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 5588 bytes
SHA-256: ac7461b15e0b74544384248cba0e60a12131d69e7f35a4ffd0531ac4a35a0570
font_01_sfnt_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 12776 bytes
SHA-256: 00575364c703e126ee18b3e89135e3171f6b18a51821a6b32f122f4085b518bd

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