Malicious PDF — malware analysis report

Static analysis result for SHA-256 148c3b36d01ebc38…

MALICIOUS

PDF

72.7 KB Created: 2021-03-31 14:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda879b35ab63d2081684320e2692d39 SHA-1: 571abdd82e0c2688fc606d9f5e9962caa2908ef6 SHA-256: 148c3b36d01ebc382cce7fe5640bc5c99072a3ef5dc9c47a43ab0ecdec0b5f92
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing site or download further malware. No scripts were extracted, but the presence of external URIs and the link farm heuristic point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=matilda+the+musical+jr+full+script+pdf+free
    • http://usesalle.xyz/how_do_i_add_a_column_to_a_table_in_google_docs1zzjb.pdf
    • http://sujabupinoda.scienceontheweb.net/sony_cyber_shot_dsc_h300_lens_removal.pdf
    • http://kunujunekedi.mygamesonline.org/medical_microbiology_book.pdf
    • http://gojavodevagajuw.mygamesonline.org/pogimenisurinefofojid.pdf
    • http://kitafoged.medianewsonline.com/canine_parvovirus.pdf
    • http://bitcoinlearningcentre.online/cbse_class_9_syllabus_reduced_2020-_21z6pr3.pdf
    • http://zedateve.mypressonline.com/33400480104.pdf
    • http://jexekiraj.sportsontheweb.net/rajidixakam.pdf
    • http://lotibamuzuti.scienceontheweb.net/stay_with_me_sam_smith_piano_sheet_music.pdf
    • http://gafuvufafokujop.sportsontheweb.net/weneboboji.pdf
    • http://i-men.ru/cub_cadet_snowblower_chute_wont_turnxmvc7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wazeniwemir.onlinewebshop.net/srimad_bhagavad_gita_in_gujarati_file.pdf
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_3886cbd4f7e544a4b6526a6170f1e139.pdf?index=true
    • https://s3.amazonaws.com/banula/el_cultivo_de_arroz_en_panama.pdf
    • https://s3.amazonaws.com/nevowimo/campership_girl_guides.pdf
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_72d75c5d67c642f0919d0a3bb8d4066a.pdf?index=true
    • https://s3.amazonaws.com/fuwenoxuzasila/batman_pc_game_highly_compressed.pdf
    • http://bekusisit.atwebpages.com/23465309723.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_off0000d182.bin
d1e4979ddcbc254631ce1dc4b0202f304f3faf46227f5cb246eda6163dc609f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 5144 bytes
font_01_sfnt_off0000e2fc.bin
5fd40a9f9a1b50dad1048fcccd4dba4fa4ac0c792fd65179f89f5e2a73b18f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 10616 bytes
font_02_sfnt_off0001070c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 4324 bytes

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