Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea7fec34f1045f7…

MALICIOUS

PDF

79.6 KB Created: 2021-03-12 03:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99f65991f3edc668756bd3f99c1b523b SHA-1: e4872fde2f9bd859a20bf67c478716f00586561f SHA-256: 9ea7fec34f1045f782b367bab32187ae864c140028e26c47ad75fc26c1a5abbc
164 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 hosted on dynamic DNS services, suggesting a link farm for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The document body, though partially corrupted, contains text related to an 'admission list', aligning with the 'SE_INVOICE_LURE' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://midufefew.ru/award?keyword=oou+admission+list+2020+19+pdf
    • https://cdn.sqhk.co/jawuraxexije/Zghcthd/68769916498.pdf
    • https://kepedeko.weebly.com/uploads/1/3/5/9/135959580/3148970.pdf
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/7782451.pdf
    • https://cdn.sqhk.co/loxosefivipo/gidighd/tabogerisibezinuravu.pdf
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5ff22ee2676f0.pdf
    • https://cdn.sqhk.co/boxepupovemu/jgB0Ap1/gagufigagipoxilujatif.pdf
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/lefufog-kinulezifevazam-favaxadubi-widagoluratep.pdf
    • https://cdn.sqhk.co/lebexuzo/ldicieX/space_marshals_apk_data.pdf
    • https://joluduloj.weebly.com/uploads/1/3/4/2/134266967/aba7a073f1c9564.pdf
    • https://static.s123-cdn-static.com/uploads/4451575/normal_5fca344ec0d14.pdf
    • http://itsamorem.com/power_point_sobre_reglas_de_acentuacionb0ys0.pdf
    • http://yachts-4-sale.com/should_there_be_water_in_my_water_softener_tank86v6z.pdf
    • http://salet.store/gomevulupuot0l6.pdf
    • https://cdn.sqhk.co/siboxowimu/bje4jby/desktop_dual_computer_monitor_stand.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://runuwug.myartsonline.com/nezexefati.pdf
    • http://xolavozezimodan.onlinewebshop.net/jinezazumixagewen.pdf
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_57207b6fb798413db1f1cc2c68ca5b7a.pdf?index=true
    • http://kewevagisugimuw.onlinewebshop.net/pelicula_100_aos_de_soledad.pdf
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_2daed75d9e034c81909475a19fd305a7.pdf?index=true
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_95ba71f829474790b94915249ebdf106.pdf?index=true
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_7cd6af9504e9469e9b455d293286c4f8.pdf?index=true
    • http://danebusuji.onlinewebshop.net/apush_practice_test.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4b.bin
a1d8a60c4fc78167ab2ddcbeda32be56b8af52be1ade7d68a35443f0773ac12e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 5364 bytes
font_01_sfnt_off0000ff6c.bin
8ae5bfb0e4e932294c93bd1d9e30e43ae5172bac5c9f830a9bb86f8918d8c8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 10380 bytes
font_02_sfnt_off00012302.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 4324 bytes

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