Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b23fac9b5f40a4d…

MALICIOUS

PDF

76.1 KB Created: 2021-04-12 07:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 804173b2435a63d25aefd175dadb220b SHA-1: 4e0e14d7afeca30b77ee45af173112fa1b783509 SHA-256: 4b23fac9b5f40a4d313e976055d18a19f3bfb64232d2dd061427bdcaf150c46b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, 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 for phishing or malware distribution. The embedded URLs and the heuristic findings suggest the document is designed to redirect users to potentially harmful content.

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://botokaw.ru/strik?utm_term=my+sweet+audrina+lifetime+movie+cast PDF link annotation
    • https://vujaroroxino.weebly.com/uploads/1/3/5/3/135314625/xedeji.pdfIn PDF document text
    • http://xojanefod.mygamesonline.org/english_aptitude_exam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503387/normal_6018372bcac00.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/betowa-fonifiwubaguwi-pegimi.pdfIn PDF document text
    • http://nositadox.mypressonline.com/7097261259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_60124336344d3.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/caterpillar_c32_generator_operation_and_maintenance_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446399/normal_5fe393c38b327.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/6600650873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5da294-0946-429c-97db-dd5a31391893/78499501611.pdfIn PDF document text
    • http://visugog.myartsonline.com/jeganewaxit.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/79779758907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4a8aaf-28c8-4acb-b125-23174bde9af8/2491636579.pdfIn PDF document text
    • http://luvetux.myartsonline.com/25645772865.pdfIn PDF document text
    • http://zapusov.atwebpages.com/calories_in_arbys_roast_beef_slider.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/believer_s_bible_commentary_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/28871717049.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/survival_quest_way_of_the_shaman_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b460209-482d-4bad-9614-9dda5ba974e6/89046733866.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/analytical_reasoning_nts_mcqs_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2c08cc-5835-4265-866f-0b4119216404/prayers_to_rout_demons.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_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 5424 bytes
SHA-256: f0f6ce3dd355cd9ac536a8915c5ba4e7c03c9b8d254bad15637cc42320858741
font_01_sfnt_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 11340 bytes
SHA-256: 3e0b6466232186dca1e0bd2fca41a986444f5f9bc5cfbc732179f4f089b6dc5c

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