Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5b1c767a4aeaa6…

MALICIOUS

PDF

73.4 KB Created: 2021-03-05 07:34:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50543a6e558b8820b0066a043afe3e5b SHA-1: daa6323bcfd670fa91e43f693dbed3a01d47e8fc SHA-256: dd5b1c767a4aeaa6ad2c4a6a53464bd653a802266951a645736b36d751676824
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 for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests an attempt to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=how+to+set+the+clock+on+my+sharp+carousel+microwave
    • https://cdn.sqhk.co/wikelere/Bgjuhed/tejifowef.pdf
    • https://fuwiwidiwijidex.weebly.com/uploads/1/3/1/6/131637339/3174b9c63d9.pdf
    • https://likimipezerejo.weebly.com/uploads/1/3/2/6/132682052/nisopexe_nakorinanivad_fuwagiz.pdf
    • https://cdn.sqhk.co/wazafanez/4hiakgi/36902581879.pdf
    • http://malanefire.sportsontheweb.net/bts_in_korean_letters_copy_and_paste.pdf
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/tugogiledirugosakix.pdf
    • https://cdn.sqhk.co/difixoruze/jhWhfgd/fireboy_watergirl_in_the_ice_temple.pdf
    • http://navevukosuso.mypressonline.com/health_data_analyst_certification_programs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_ee234a67a2774903909b7043b8fa69c4.pdf?index=true
    • http://fuguzametekobo.myartsonline.com/a_dolls_house_movie_script.pdf
    • https://uploads.strikinglycdn.com/files/925a75d7-5d20-43fb-a994-1f7336bd4df6/vixijavilesave.pdf
    • https://uploads.strikinglycdn.com/files/92b88231-9635-4970-81b9-033fedbcd942/8956256025.pdf
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_d55acd9e568c4629b9a6f9a72e22fadc.pdf?index=true
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_b27137e6bf70477990b1fba5ad8325c8.pdf?index=true
    • http://sanugifop.atwebpages.com/gofobirebenemobilusipi.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/ac_dc_back_in_black_album_free.pdf
    • https://uploads.strikinglycdn.com/files/f5c40d7d-60ed-4275-803d-0098691fad0a/47674229675.pdf
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_ae3ac6fcbddf46ef8efc8a574499bd43.pdf?index=true
    • https://s3.amazonaws.com/suxuzubojut/is_the_us_justice_system_fair.pdf
    • https://uploads.strikinglycdn.com/files/cbf8a15e-306e-425e-a93b-cd85b792c2eb/toginuwedovix.pdf
    • https://uploads.strikinglycdn.com/files/2544827b-2b0e-4462-bf7a-f2c85eb1dc05/mlk_letter_from_birmingham_jail_shmoop.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_off0000e1f7.bin
dd117ef5e76df624caece0c697342a88c344d9f541bdbda7116d436e13afc170		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F7 5452 bytes
font_01_sfnt_off0000f472.bin
6c2cc96a2dcce25eea9fb95468afa9da60bc6cd539a21eb72523a1fa284ca1a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 10212 bytes

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