Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc82b1d2f6867b71…

MALICIOUS

PDF

72.1 KB Created: 2021-03-17 03:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e12f7f0fe5472caddcc51723d60fe9e SHA-1: 71adb71cf65d76940d5461229bb6b9ad1829d003 SHA-256: cc82b1d2f6867b71d4b790c8cb909e4697140f7c371f16d6de46d3f6529758ef
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or phishing attempt, aiming to direct users to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/123?utm_term=text+past+simple+and+continuous+pdf
    • https://dedolodaramolon.weebly.com/uploads/1/3/1/4/131455072/nizekukubala_nibuwolepixetex.pdf
    • https://cdn-cms.f-static.net/uploads/4477167/normal_602e166265122.pdf
    • https://gadudomarun.weebly.com/uploads/1/3/4/7/134705140/kurutizewivoraxet.pdf
    • https://cdn-cms.f-static.net/uploads/4408184/normal_5fe64ee2592ff.pdf
    • https://jamojibo.weebly.com/uploads/1/3/5/3/135349767/mefejebok.pdf
    • https://debinezituxi.weebly.com/uploads/1/3/4/3/134339783/8179380.pdf
    • https://nuxabofubuwaxef.weebly.com/uploads/1/3/2/7/132740905/1aafb8cf79d1821.pdf
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/pitidazika.pdf
    • https://fojaxusulilunud.weebly.com/uploads/1/3/1/3/131381134/3158883.pdf
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5fe2aabca4ccb.pdf
    • http://natorg.fun/90437727190be08f.pdf
    • https://vumazara.weebly.com/uploads/1/3/0/7/130738753/b5170eda.pdf
    • https://gitexapovaje.weebly.com/uploads/1/3/4/4/134464395/3470829.pdf
    • https://jipujiro.weebly.com/uploads/1/3/1/0/131069764/0ba450396ed4d.pdf
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/xafep.pdf
    • https://cdn-cms.f-static.net/uploads/4401515/normal_603f5d143e149.pdf
    • https://gojenejanoz.weebly.com/uploads/1/3/0/7/130739654/sugufulele-gedemudum-jiropip.pdf
    • http://helpcontactform.com/portadas_para_word_formales_gratisill2j.pdf
    • https://static.s123-cdn-static.com/uploads/4369334/normal_6004a2db368b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/buxoparadazegu/an_inspector_calls_responsibility_quotes.pdf
    • https://s3.amazonaws.com/jumedemimo/kusedufetabe.pdf
    • https://s3.amazonaws.com/dabatisew/activinspire_studio_for_free.pdf
    • 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_off0000de97.bin
f44bd20e7790b4b5414eb0ccacb17fb1dcab1a6e63759e4dd986236b2ca941a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE97 5220 bytes
font_01_sfnt_off0000f051.bin
8dd9c2af15617159208df9877dca87d2468c216d21f367586be2c775bbcdf9dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 10380 bytes

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