Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57ae78ff4c8d037…

MALICIOUS

PDF

75.5 KB Created: 2021-03-13 16:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: aa220b38bd3d9385a2b170ade827510c SHA-1: 506c9b1af3648fb8915c3e1e490e558b0a3f8946 SHA-256: b57ae78ff4c8d037e1df7cb6409babcc56ee5fc0d3d99e1d678aaf3ab3db05dc
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, with a primary focus on 'https://fokemale.ru/strik?utm_term=pentair+superflo+vst+pump+manual'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=pentair+superflo+vst+pump+manual PDF link annotation
    • http://vibunitetebavi.22web.org/11411524814.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/iaibLIv/alphabetty_saga_niveau_472.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/hchaiin/55721511288.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/mowuzukejof_xepudozaran.pdfIn PDF document text
    • https://kofijowuz.weebly.com/uploads/1/3/4/4/134446653/698392.pdfIn PDF document text
    • http://zakukamupavi.22web.org/carlos_ruiz_zafon_la_sombra_del_viento_saga_orden.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/2162889.pdfIn PDF document text
    • https://tunegize.weebly.com/uploads/1/3/4/5/134500295/7865331.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/beriv-nipovevuw-moxaxefasimo-xufan.pdfIn PDF document text
    • http://kosolibanun.iblogger.org/60634073981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dawubiri.rf.gd/que_significa_adviento_para_los_catolicos.pdfIn PDF document text
    • http://vafowoloxesimam.rf.gd/vepawax.pdfIn PDF document text
    • http://zuwarikufaz.epizy.com/loseduj.pdfIn PDF document text
    • http://jabepujun.epizy.com/keful.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/how_to_charge_citizen_eco_drive_watches.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/3177270609.pdfIn PDF document text
    • http://jonokib.rf.gd/26379696940.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/97905126250.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/reporting_homogeneity_of_regression_slopes.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/ropupirugikomelawomo.pdfIn PDF document text
    • http://zasegusof.epizy.com/66429415044.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_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 5108 bytes
SHA-256: 7abdf9cbb48e784efc7d928cf301e06f54837cef4bc9dfa4970918d2579679ec
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 10968 bytes
SHA-256: 2f87e0f85019ee2a23f23faa35e073a0ed6b0cb9c0ed35aa8d6062dc714237c8

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