Malicious PDF — malware analysis report

Static analysis result for SHA-256 4075fda290694134…

MALICIOUS

PDF

74.1 KB Created: 2021-06-02 03:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e7b36d7dd407b155357609f0baab627 SHA-1: 91a8718262808f8242605708170cb6e486ecdfcc SHA-256: 4075fda29069413411f71124127a8e6c664820c98b54483ffdf26f8bb3538e41
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, with many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document's content appears to be a lure related to Excel functionality, but the primary malicious activity is the extensive network of outbound links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/pbw?utm_term=how+to+find+f+critical+value+in+excel
    • https://pagajunudew.weebly.com/uploads/1/3/5/9/135992687/jogodifovek.pdf
    • https://watumuguv.weebly.com/uploads/1/3/2/6/132695830/75331929d.pdf
    • https://nunofisodopuw.weebly.com/uploads/1/3/4/2/134234763/2651714.pdf
    • https://viluxesoxumubi.weebly.com/uploads/1/3/1/4/131406714/dadogi.pdf
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/bebivunivopodajepa.pdf
    • https://dewubolisevibe.weebly.com/uploads/1/3/4/3/134318954/ce862bbabe02fe.pdf
    • https://cdn-cms.f-static.net/uploads/4407571/normal_5fdb40f1bbec1.pdf
    • https://makogoporuri.weebly.com/uploads/1/3/4/8/134868573/8349083.pdf
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/rutipakuwisopu.pdf
    • https://pebizadovabunal.weebly.com/uploads/1/3/4/7/134711288/lujopigebido.pdf
    • https://mekiwukokoviv.weebly.com/uploads/1/3/4/8/134867966/33f75fdbe8dc19.pdf
    • https://cdn-cms.f-static.net/uploads/4382196/normal_60299914d509d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d1ceef2-f8e9-4f14-b466-b1bfa7704a3f/kindle_d01100_battery.pdf
    • http://poxanoralanu.pbworks.com/f/ap_yaynlar_11.snf_fizik_1._fasikl_indir.pdf
    • http://wuxikadafi.pbworks.com/w/file/fetch/144417942/games_like_clash_of_clans_for_pc_offline_free_download.pdf
    • http://ruwezebom.pbworks.com/f/meparozategopidowe.pdf
    • http://wepoline.pbworks.com/f/lwarb_beta_for_iphone.pdf
    • http://sepaxebi.pbworks.com/f/what_is_certificate_of_residence_malaysia.pdf
    • https://uploads.strikinglycdn.com/files/67e21e5f-e0be-4080-90fc-4f99ac10210f/dunogusatenokonor.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_off0000e180.bin
f02f2877ed715b3b1d486749c059884057ab32427cc58f63c351a8888ea614f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 5016 bytes
font_01_sfnt_off0000f2b9.bin
58982abea7d2455c3214577c8229de7b6d50ed973dc6430e08d20b99007f7f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 11928 bytes

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