Malicious PDF — malware analysis report

Static analysis result for SHA-256 167aa61072adca83…

MALICIOUS

PDF

74.6 KB Created: 2021-03-26 10:21:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c91a3cf146545e48d92dfe23cf0409e SHA-1: 385ed5551730101fca7162bce1510b5ae89cb9c2 SHA-256: 167aa61072adca83638eed2fa5f5e03ccf11287984c97e95f53068ca18eb411a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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-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://soxebez.ru/123?utm_term=abap+sap+tutorial+pdf
    • https://mebodamuruwij.weebly.com/uploads/1/3/5/4/135400263/4691349.pdf
    • https://dibovasejul.weebly.com/uploads/1/3/1/0/131070518/basodipiragupe.pdf
    • http://italia-doc.space/67441546090qaf5w.pdf
    • http://hdvideo.design/what_was_the_background_of_brown_vs_board_of_educationyfflh.pdf
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/mojufapuvadiliw_viluxu_finamarimaxu_zapixomowu.pdf
    • https://gajatizu.weebly.com/uploads/1/3/5/3/135315297/4a06c4fc.pdf
    • http://help-igcopyright.xyz/99329492749q0b0r.pdf
    • https://cdn.sqhk.co/niririga/UJvZhav/3_point_hitch_blade_for_sale.pdf
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/nuwuxuparudaxoz.pdf
    • https://cdn.sqhk.co/losomilodip/hihiege/real_bowling_3d_pro_apk_free_download.pdf
    • http://logvoz.ru/database_systems_design_implementatixhzyy.pdf
    • https://nikidedinuxilal.weebly.com/uploads/1/3/1/4/131437821/madatimodogasosuj.pdf
    • https://kurinasuvofete.weebly.com/uploads/1/3/5/3/135334761/kogalekogezixorejani.pdf
    • https://cdn.sqhk.co/dowusutitozi/gdnbEmd/b2c_marketing_strategies_on_social_media_project.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xijilesuzuxo/29384619760.pdf
    • https://s3.amazonaws.com/kaxukok/27176926390.pdf
    • https://s3.amazonaws.com/liwafo/jegomipupewudifoxipebel.pdf
    • https://s3.amazonaws.com/vizegemawokaxe/nixipisovoxaxegozalos.pdf
    • https://s3.amazonaws.com/fixararololu/79843297637.pdf
    • https://s3.amazonaws.com/purixifusipelid/45133192806.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_off0000def1.bin
f295a2bfcdeab9529aa6ac8b21eced975fbbed609d9d1768c6417b6763c9500b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF1 5164 bytes
font_01_sfnt_off0000f082.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 1800 bytes
font_02_sfnt_off0000f90f.bin
c84c16bfd69b0934d2ffd2e7f5f41b3961dc25130d492e4cfee8c1d2e8ec12e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 10620 bytes

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