Malicious PDF — malware analysis report

Static analysis result for SHA-256 03563962487c41a0…

MALICIOUS

PDF

90.0 KB Created: 2021-03-30 04:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c13eb6176973b540f77aa5ad4def706 SHA-1: d151a713cee5288e9094dba568ce8fd8e47394bd SHA-256: 03563962487c41a0fa1557256ec3b6a26f7c354106d522ad89ac9aba9469dddb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a potential phishing lure related to academic referencing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest this document is part of a larger scheme to drive traffic to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=in+text+referencing+harvard+style+pdf
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5fe275f3f24ea.pdf
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/e8c6f0fa0ec1.pdf
    • https://dosukasexu.weebly.com/uploads/1/3/1/6/131637789/2396365.pdf
    • https://static.s123-cdn-static.com/uploads/4369331/normal_5fff930e7db32.pdf
    • https://cdn-cms.f-static.net/uploads/4491439/normal_604d87b681393.pdf
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/gofazedip-vogogaluv-luzumor.pdf
    • https://cdn-cms.f-static.net/uploads/4423136/normal_60150dab78022.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/12823f84-16c2-458f-bcc3-6eddfcc18e9d/how_much_do_disney_college_program_get_paid.pdf
    • https://s3.amazonaws.com/mizeteb/dobobutekugome.pdf
    • https://s3.amazonaws.com/nerugiraxura/butowe.pdf
    • https://uploads.strikinglycdn.com/files/3b4f0e8c-1467-4e23-bfc5-456d8530b4c5/lodorisiferep.pdf
    • https://s3.amazonaws.com/gebukil/popaxenurut.pdf
    • https://s3.amazonaws.com/silubebebefuju/xekugoxozegupikazuxiduj.pdf
    • https://s3.amazonaws.com/nokiva/l_alphabtisation_au_senegal.pdf
    • https://s3.amazonaws.com/lolijexejomak/vapetajeketodefeveki.pdf
    • https://s3.amazonaws.com/mefonevimimix/ignou_bcom_syllabus.pdf
    • https://s3.amazonaws.com/gisujubolidine/analog_four_manual.pdf
    • https://s3.amazonaws.com/likadojivivofu/jio_phone_mein_play_store_game.pdf
    • https://s3.amazonaws.com/sugosubexez/cima_management_case_study_model_answers.pdf
    • https://s3.amazonaws.com/kovilowab/android_activity_lifecycle_listener.pdf
    • https://uploads.strikinglycdn.com/files/2ed343f7-e94c-41ec-ae79-5bbb3fa75648/wagirifirotatote.pdf
    • https://uploads.strikinglycdn.com/files/6b228322-eb9a-4f5e-8f9b-6b6b244be862/30498214079.pdf
    • https://s3.amazonaws.com/sojenozap/zurifag.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001207b.bin
d3f760c5f19084388396a65d3853f1b54df1538754f39635c817ddb4d8c7369f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207B 5584 bytes
font_01_sfnt_off00013386.bin
ca330255fbff1d6d1da0dadacd664a0e4845908985bee3b380c0c27c2dfc57f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13386 11532 bytes

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