Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e0a1796703fdbe…

MALICIOUS

PDF

89.4 KB Created: 2021-03-27 17:23:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eec1868aa22783a1f65e317b7649014 SHA-1: 759e3c2042f64635e3071cf34e9171d403872bc0 SHA-256: b4e0a1796703fdbe0bacd8ef1b6661f4a16e96c1213fe46289521aef6e113001
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a phishing or content-farming attack.

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://bologen.ru/wix?keyword=haitian+revolution+causes+essay
    • https://cdn.sqhk.co/wubunepan/gjmJjfM/interesting_stories_to_tell_about_yourself.pdf
    • https://cdn.sqhk.co/gibuzini/jieBpjd/4363800036.pdf
    • https://cdn.sqhk.co/wofunukasu/aghf7gf/twisted_root_burger_co.pdf
    • https://cdn.sqhk.co/rorajakura/Sgdjetl/mountaineering_classes_denver.pdf
    • https://cdn.sqhk.co/xotosobupis/Khedqja/best_nail_biting_treatment_for_toddlers.pdf
    • https://cdn.sqhk.co/kitolitik/jjinWjf/xemum.pdf
    • https://cdn.sqhk.co/terasovo/UCjeZST/facebook_app_for_windows_10_64_bit.pdf
    • https://cdn.sqhk.co/pozusonitid/zlBcgj9/blossom_blast_saga_online_pc.pdf
    • https://cdn.sqhk.co/mapexovebo/b9qWtif/talk_and_chat_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d9d98d5e-e252-4d52-8c8c-bae348938f23/how_to_play_fantasy_football_for_beginners_yahoo.pdf
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_73b36e7b87004dffbf93bd92201f771d.pdf?index=true
    • https://s3.amazonaws.com/jidosatikim/bosasirujisafusobisezo.pdf
    • https://s3.amazonaws.com/kabisebax/toyota_corolla_hatchback_manual_for_sale.pdf
    • https://s3.amazonaws.com/kawotexulozax/15022378323.pdf
    • https://uploads.strikinglycdn.com/files/f9a24d8e-3375-40bf-bef3-882b5745c8a8/rekojejovetowalale.pdf
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_3b97ae3f1cba44469e9edb9cbf94bc70.pdf?index=true
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_59f2ca5a13a44dafbecbfce1f0658e5f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5a359686-31f4-4058-9ca8-fd91d5fcfcb4/kisiti.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_off000122ae.bin
e9587f5c7f614677c52e1585285e36b2189bac501c4221cdbdf287d2aa794673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 4916 bytes
font_01_sfnt_off0001337c.bin
e5ee3e647bca412fec1b496fbddb2262ade19daa51b7ce7b0cca367d081b2890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1337C 10856 bytes

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