Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae7aad496ce15a0…

MALICIOUS

PDF

72.5 KB Created: 2021-03-30 19:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eb35f142d4128285d7a3074fe869933 SHA-1: 7b29935e32d29081d7028c9f1a3409ce1cdbdc38 SHA-256: cae7aad496ce15a0232037c128eddc30fe86bfb6a817d2d904f268704e3bf879
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs likely lead to further malicious content or phishing pages.

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/123?utm_term=phrases+and+clauses+worksheet+ks2
    • http://momentshop.website/green_pumpkin_squasheu9jl.pdf
    • https://cdn.sqhk.co/nogegamapagi/ijmGQ81/21734991873.pdf
    • https://cdn.sqhk.co/sunomedude/bsrlub5/80s_music_radio_station_los_angeles.pdf
    • http://evatopshop.xyz/belton_isd_athletic_physical_formfwi0l.pdf
    • https://cdn.sqhk.co/wazafepel/bSejhIm/mexican_train_dominoes_gold.pdf
    • https://waderiraxobo.weebly.com/uploads/1/3/4/5/134505054/jifas-zumunasa.pdf
    • http://megiloreb.mypressonline.com/zojodilobi.pdf
    • https://cdn.sqhk.co/kexofodatop/AJiaDGj/fall_nail_designs_with_leaves.pdf
    • http://iminn.ru/cuisinart_prep_11_manualf103n.pdf
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/a1798ad157.pdf
    • https://detatabuloto.weebly.com/uploads/1/3/5/3/135346227/83a409defa6.pdf
    • https://taboloralo.weebly.com/uploads/1/3/2/7/132741194/9a8e81efef89c.pdf
    • http://tublitalia.fun/41022686073voapb.pdf
    • http://bakavorun.getenjoyment.net/the_adventure_zone_graphic_novel_free.pdf
    • https://cdn.sqhk.co/korokotuduki/Te9jeje/lididifupojuj.pdf
    • http://copyrightnotices-form.com/96070772304ucys5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://risuveliki.rf.gd/photolithography_process.pdf
    • http://runapapaxezupow.rf.gd/english_speaking_notes_free.pdf
    • http://femasusatatovet.epizy.com/82197154030.pdf
    • http://zanebinelit.rf.gd/markup_drawings_on_ipad.pdf
    • http://mewatubaliz.epizy.com/manualidades_faciles_para_nios_san_valentin.pdf
    • http://zisukuvi.atwebpages.com/is_chicco_fit2_worth_it.pdf
    • http://xesijapapun.rf.gd/domotuzedomu.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_off0000de6d.bin
a987d76b1c89c79fa1e70f693c0f66e8a4887b64df247f0edcecec550cab5b6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 5316 bytes
font_01_sfnt_off0000f08c.bin
9a3897cc449fe7d689a59d9e625d4002e615f116d0184364b3a049d65e752567		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 10640 bytes

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