Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f38259beab980e8…

MALICIOUS

PDF

76.1 KB Created: 2021-03-13 22:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 26c742dc774444871f0e742468c42744 SHA-1: 647177cbe5efd8a023468f4d411ae9ac2db6f047 SHA-256: 3f38259beab980e8a545df14b59b3be082502d4865d621ed4adef1e127aab644
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'answer key' and 'portales', aligning with a lure to trick users into clicking malicious links.

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://golowaki.ru/wix?keyword=vhlcentral+portales+answer+key PDF link annotation
    • http://pokuwasu.iblogger.org/71230762287.pdfIn PDF document text
    • https://voxugenones.weebly.com/uploads/1/3/1/8/131871951/lopezod_puled_magexu.pdfIn PDF document text
    • http://jabisoj.22web.org/camtasia_studio_8_free_filehippo.pdfIn PDF document text
    • http://pitupunum.iblogger.org/personal_statement_sample_essays.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463791/normal_601581debf4a4.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/17jjhgx/mighty_battles_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/bojesave/hdhfzUA/affidavit_of_illegitimacy_philippine_legal_forms.pdfIn PDF document text
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/gidilujipakugalozuge.pdfIn PDF document text
    • https://lexugorubu.weebly.com/uploads/1/3/0/7/130776619/vaziwesilituvixik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_601493e4ac455.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/iZ6SgjY/mamazedubom.pdfIn PDF document text
    • https://volifinidolil.weebly.com/uploads/1/3/0/8/130873876/kowuwolel-nemipat-ragasufijotef-tezariwedamovok.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/EbDkihm/vesafupajivebufuvavenowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401540/normal_5ff0e524b03a1.pdfIn PDF document text
    • https://sutenemumam.weebly.com/uploads/1/3/5/3/135323571/6425478.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bojifif.rf.gd/14461964007.pdfIn PDF document text
    • http://fujuresaw.epizy.com/2259825407.pdfIn PDF document text
    • http://dukedofabi.epizy.com/hotel_development_business_plan.pdfIn PDF document text
    • http://pugipig.rf.gd/wativ.pdfIn PDF document text
    • http://gegapitigiz.rf.gd/ccna_security_dumps.pdfIn PDF document text
    • http://gijewitog.rf.gd/luxowowetisurovekujen.pdfIn PDF document text
    • http://xixakoju.rf.gd/cashew_nut_health_benefits.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_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 5244 bytes
SHA-256: 99c2f8bea48eb8b47032281c7b0c5a9f1cfa7864689f75227e3a3d6fd3012fe0
font_01_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 10592 bytes
SHA-256: bed22a02a3ba75d37d135a620903e125d9d795884c3da86a047d305b2a197f81

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