Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c87345a8ec3f55…

MALICIOUS

PDF

111.0 KB Created: 2021-03-14 20:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: aad75d37788a219c49ecb56aafb6281e SHA-1: f016a556adf0e143f3278a05b98e82525cbb9155 SHA-256: e1c87345a8ec3f558315c8773a2cd9e17e044ca61d264ee57a61c6d4b4d4c2cb
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious websites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=akuntansi+manajemen+ut+pdf PDF link annotation
    • http://wejuzofibab.medianewsonline.com/27618789440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457847/normal_5fe6ea1d9ceb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_603c2e50c0fcf.pdfIn PDF document text
    • http://xojitufos.66ghz.com/78578001600.pdfIn PDF document text
    • https://cdn.sqhk.co/gatutojuse/RP7lCar/guess_the_flag_sporcle.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/principales_simbolos_de_diagrama_de_flujo_en_programacion.pdfIn PDF document text
    • https://cdn.sqhk.co/likamigid/aJmMgfw/9785553859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424405/normal_604d16218457f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_45d5e27e39944685a638c6ec7ebee135.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_f7ef6311f44f4074807e6dbab388ae84.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_100e241014624e4d94965c92aa688575.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/pulur.pdfIn PDF document text
    • http://zixadadafupeg.epizy.com/41998701887.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_b661a8176c5b4347b6decea714e86eec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/how_much_does_it_cost_to_service_a_mobility_scooter.pdfIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_f18ab63300e74155a11c84e5f1356d8a.pdf?index=trueIn PDF document text
    • http://nedugone.epizy.com/jizadimuvita.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_off00017720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17720 5188 bytes
SHA-256: 0414919965d583812751844c75e0ed7340fa1efe12657601b009a4c290f33fbb
font_01_sfnt_off000188c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188C4 11100 bytes
SHA-256: 99f20536c5c37d9bf740e528c53539ab7131792fd358bb860f12932d8bf71b06

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