Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f5cfe74a677924…

MALICIOUS

PDF

85.5 KB Created: 2021-03-15 09:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad8563afc09c39ad41fe2565a5404567 SHA-1: 5e94939511fe0d759875643b0b8863a737a66669 SHA-256: a8f5cfe74a677924b5948321259183ac4c2558061baf561cc55d0cb501f40aa2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were directly extracted, the PDF structure and heuristics point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=practical+big+data+analytics+pdf
    • https://cdn.sqhk.co/nazamesuwute/jdgihcV/95194632520.pdf
    • https://static.s123-cdn-static.com/uploads/4405443/normal_60023acd17e43.pdf
    • https://cdn.sqhk.co/wevujawej/Jhed5hf/irregular_verbs_worksheet_middle_school.pdf
    • http://kengoru.space/myasthenia_gravis_adalahpkfie.pdf
    • https://cdn-cms.f-static.net/uploads/4421336/normal_603e33f4121be.pdf
    • https://cdn-cms.f-static.net/uploads/4367667/normal_6033766b31059.pdf
    • https://cdn.sqhk.co/genamudazunu/hifcjhc/commercial_bank_of_ethiopia_mobile_banking_activation_code.pdf
    • http://cancandance.org/casio_exilim_camera_12.1_megapixel_priceyqdbu.pdf
    • http://13millions.store/arabic_language_booky487o.pdf
    • http://naturapple.space/91001807352ok97n.pdf
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5fce0e2990dc0.pdf
    • http://eduha.online/3987921030620rd1.pdf
    • https://static.s123-cdn-static.com/uploads/4497110/normal_5fffec1d8a507.pdf
    • https://static.s123-cdn-static.com/uploads/4378165/normal_60009b77dc228.pdf
    • https://cdn.sqhk.co/mepapogivoma/hgMChgD/zombie_apocalypse_2_unblocked_77.pdf
    • https://cdn.sqhk.co/noluxokeruma/iihBheG/supinifobaxen.pdf
    • https://cdn.sqhk.co/ragebobeb/jchbgcv/14620598643.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0b670cc3-d94b-4117-8b98-7ce677fb6c21.filesusr.com/ugd/7bc559_667118cfedf5473bb4df68982bf19e53.pdf?index=true
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_abdead3e352341cf835b57d746081598.pdf?index=true
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_72083dacdd604865a0c986ac6ff3e5ec.pdf?index=true
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_576434ed4a82407aa423ac92ab246d94.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_54b70632def94d2c8cf4f144530a8a80.pdf?index=true
    • 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_off00010e1a.bin
215ce5248e570549243368c23d9f1f65d588e02dd8587dc6b08a34371f844196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 5564 bytes
font_01_sfnt_off00012115.bin
740c190dc3a27b191fa2c79f4154cf6facf0adc4938175733ad046affd818e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 11240 bytes

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