Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a0244701eeca61…

MALICIOUS

PDF

70.0 KB Created: 2021-02-20 18:32:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 278947c2867c7953bd830f626c5145bf SHA-1: f7f6a8178fceeefc5cb38a3b871ea6383b0a3c69 SHA-256: 85a0244701eeca6117c3f7c315292a33002abd1dc15e8e387b1b5ec294d4bddd
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 machine learning classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to disposable hosting and redirectors, characteristic of a link farm designed to distribute phishing or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

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://baarspo.ru/strik?utm_term=d-link+unified+services+router+dsr-250 PDF link annotation
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/9344447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490369/normal_60027c923bbd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424647/normal_5fcba25342a42.pdfIn PDF document text
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/2498800.pdfIn PDF document text
    • https://zowukudikumo.weebly.com/uploads/1/3/1/3/131382828/3969441.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/943538e.pdfIn PDF document text
    • http://frontglass.xyz/kitaxu0p58f.pdfIn PDF document text
    • https://cdn.sqhk.co/wexifidobafo/ijhbxZ5/39503036542.pdfIn PDF document text
    • https://rekazisiw.weebly.com/uploads/1/3/0/8/130874265/kejevesarufe.pdfIn PDF document text
    • https://jisenevezapa.weebly.com/uploads/1/3/4/0/134095859/95f96d.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/jj5kuii/aio_launcher_pro_apk_latest_version.pdfIn PDF document text
    • https://vijibasotaxeja.weebly.com/uploads/1/3/5/9/135990507/jozufigujimororonedu.pdfIn PDF document text
    • https://kuwuxezito.weebly.com/uploads/1/3/6/0/136090431/fijopikexipanapek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/sivan_aghori_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/broadsheet_sydney_cookbook.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_off0000d405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 5360 bytes
SHA-256: c74e5cd95234a3b0b18231c114099c585502537c7b886224a68572db2b52a659
font_01_sfnt_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 11312 bytes
SHA-256: 127f7e88b63c41608f5d8a8b63f4f88826dcbe42ec20b2d87d7a5774d0cab958

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