Malicious PDF — malware analysis report

Static analysis result for SHA-256 583c3ab482106e92…

MALICIOUS

PDF

82.7 KB Created: 2021-05-02 14:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c90bb2206feb927fb3cf97e8dc6de43 SHA-1: b6068e1054a90db18c04a1a4e4447bc81dfc6c01 SHA-256: 583c3ab482106e92fb830ac5a5a5bdca8cdede6f3afeffa64cc0369fc7b1e29b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=funny+fantasy+books+for+young+adults
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/7997576.pdf
    • https://cdn.sqhk.co/moromasi/cmieid6/tenexikegaxojutosijo.pdf
    • https://cdn.sqhk.co/pekobenew/ihH5sig/wands_mod_1._11._20.pdf
    • http://tokexal.medianewsonline.com/12541687195.pdf
    • https://musevurimimurom.weebly.com/uploads/1/3/4/7/134711136/5dc03182ef5e.pdf
    • http://navevukosuso.mypressonline.com/12251230048.pdf
    • https://cdn.sqhk.co/bujasugawo/1SiepB2/bijojitovimededobugewasa.pdf
    • https://bopupuvi.weebly.com/uploads/1/3/1/6/131636777/512344.pdf
    • https://jupikojeba.weebly.com/uploads/1/3/0/9/130968920/dabemanipaxofe-zorosirok.pdf
    • https://fezadegijowazon.weebly.com/uploads/1/3/4/0/134096780/xekumub.pdf
    • https://wefidabewurar.weebly.com/uploads/1/3/1/1/131164485/5612215.pdf
    • http://zeboxagekej.sportsontheweb.net/topiwobatijibozuxuwe.pdf
    • https://cdn.sqhk.co/buvaboda/gieghja/72335765305.pdf
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/d97d8b6.pdf
    • https://bijuvija.weebly.com/uploads/1/3/5/3/135306534/7903af4f19.pdf
    • https://xagofutaruv.weebly.com/uploads/1/3/4/3/134344009/eec2c5fb1505a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lugivodunoxasi.atwebpages.com/laxufejukekefi.pdf
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_08f58fd559844d25bb137f23f0342a3f.pdf?index=true
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_6925f68be94d4641b5a7c80abec87d6d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010396.bin
079b978faf0042d6e0f45442ffc443666e1f2ec2bdfab59464737d59cddb8547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 5336 bytes
font_01_sfnt_off000115dc.bin
1a57aa70208549a2a0c96454606fff4c195a46731a72b0ad9ac72ca347c39232		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 11456 bytes

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