Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c0324a90d55462…

MALICIOUS

PDF

75.4 KB Created: 2021-03-29 20:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a520e51fe7f9518a37410d1525c3178 SHA-1: e0760b74da4033b661f3046f336a25d074fd661a SHA-256: a4c0324a90d554629011df11e184ce0cfcedb135bc47fda3a99bb26a1740dae3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs, such as https://botokaw.ru/strik?utm_term=microsoft+windows+server+2012+r2+standard+iso+download, are likely used to redirect users to malicious content or download further malware. The document body, though heavily obfuscated, appears to contain keywords related to software downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=microsoft+windows+server+2012+r2+standard+iso+download
    • https://cdn.sqhk.co/migixurej/IijofMF/inside_out_lyrics_clipping.pdf
    • https://cdn.sqhk.co/savujegu/LpjcEH2/60085380295.pdf
    • https://cdn.sqhk.co/mofipife/2Egehas/check_cashing_store_near_me_now.pdf
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/8374963.pdf
    • https://fanuterose.weebly.com/uploads/1/3/3/9/133999321/vugokebuwuj.pdf
    • https://cdn.sqhk.co/sowodopevew/hjhahbJ/gangmasters_licensing_authority_active_check.pdf
    • http://jawunefuda.mygamesonline.org/xofogazeluwavejaze.pdf
    • https://bemujegifa.weebly.com/uploads/1/3/5/3/135312506/666dd7d.pdf
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/migonepuxovedotogegi.pdf
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/nezituwezapi_basiviwegan_vutimu.pdf
    • https://ragixadimeruwu.weebly.com/uploads/1/3/4/8/134897014/6658167.pdf
    • https://wezoduvum.weebly.com/uploads/1/3/4/0/134096245/bewizaxixobibulasavi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bed2d873-735b-46bb-a8a3-264d0455df4e.filesusr.com/ugd/03ede2_2c5770ff7dd74a88b3f663277c51bf3f.pdf?index=true
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_d76d4f14f9d241ca9ccdd0d0d4c91c66.pdf?index=true
    • http://sajomapujozokux.onlinewebshop.net/paxebopivefivekiluvapot.pdf
    • https://s3.amazonaws.com/jusagi/how_to_solve_normal_probability_distribution.pdf
    • https://s3.amazonaws.com/fajeloninesitel/bob_books_set_1_online.pdf
    • https://s3.amazonaws.com/setikizo/wix_insert_html_code.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_off0000e6f6.bin
4326eebed686116790d30ba3ec69ec7307d60d0b8de51949fac4b654eeb45477		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 5500 bytes
font_01_sfnt_off0000f9e2.bin
54a4d15cbb6d7b7adc65d09c51cfa9127cfe978393feaf7508366359d0dd413e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 10552 bytes

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