Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6d31d406b6d795…

MALICIOUS

PDF

87.3 KB Created: 2021-03-17 19:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: dcd547b67bc4a93dbe50fd752831dd38 SHA-1: 9f135a7e19716b4f86b067b0c75e78bd7d590574 SHA-256: cd6d31d406b6d795e14a31f99b9ca3cd88c788bccc9cd585d2498e410a3322ff
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/award?keyword=medical+fitness+certificate+format+for+college+admission+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5fda1f20a1946.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_600005f858137.pdfIn PDF document text
    • http://sokepazetovul.22web.org/accidental_death_of_an_anarchist_analysis.pdfIn PDF document text
    • http://nevogixire.22web.org/telugu_movies_2018_tamil_dubbed_hd.pdfIn PDF document text
    • https://xojunujad.weebly.com/uploads/1/3/1/1/131164104/noradusif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422386/normal_5fee9a2142f2d.pdfIn PDF document text
    • https://fotawadibegul.weebly.com/uploads/1/3/1/1/131163643/8109906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_6022142284a79.pdfIn PDF document text
    • https://dopakuxapat.weebly.com/uploads/1/3/4/8/134895633/2239968.pdfIn PDF document text
    • http://mx50off.info/peresivxwche.pdfIn PDF document text
    • http://dirujadejefogax.iblogger.org/open_source_business_card_scanner_android.pdfIn PDF document text
    • http://dupipavigojas.iblogger.org/real_madrid_dei_galacticos_formazione.pdfIn PDF document text
    • http://prechambre.xyz/84032490824imv0j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393641/normal_5ff3fb934c067.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xotaxebotejij.rf.gd/fomes.pdfIn PDF document text
    • http://bazoniwawore.epizy.com/35226205736.pdfIn PDF document text
    • http://lozekav.epizy.com/instax_mini_8_film_10_sheets.pdfIn PDF document text
    • http://nodefojabotozij.rf.gd/kofesenibapulifesen.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/blues_guitar_lessons.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/nec_national_electrical_code_wikipedia.pdfIn PDF document text
    • http://leribilif.rf.gd/wevilexamisedel.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/uncle_tom_s_cabin_book_free.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_off000117b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 5480 bytes
SHA-256: fe8924ee09346c3c29a5b63324fe3c1fcbe4532636c57a1ba16c24010df96599
font_01_sfnt_off00012a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A53 10768 bytes
SHA-256: 36e2994f47d6a754327ffcfd763695d588d59c466e7effa57fcfba02661d53f5

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