Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d19bdeaff8b16b0…

MALICIOUS

PDF

79.4 KB Created: 2021-04-01 13:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b884aba9874a3a30f8b2880e41e8d81b SHA-1: a64e8038c6647bee4ca35251c1d3dc4c2b27fcaa SHA-256: 4d19bdeaff8b16b007e601f5ea4efefaa7a461d94722fbdc191924eaf8475b36
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to 'ponafet.ru', which is flagged as a suspicious URL. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://ponafet.ru/wix?keyword=american+tow+truck+show
    • https://cdn.sqhk.co/wemorapi/Tiihcjj/zaxatifak.pdf
    • http://fbcopyright-center.com/annabelle_3_full_movie_in_englishxjeuq.pdf
    • https://cdn.sqhk.co/jerivudofin/4TShiu2/fapakifekaw.pdf
    • https://cdn.sqhk.co/sanobude/jhjd2gi/adobe_reader_version_11._3_free.pdf
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdf
    • http://arfesopt.com/225477478787vuh5.pdf
    • http://sandiego-podcasts.com/20335683589xog6d.pdf
    • http://biolinkus.me/pesujukukanogiduvekepazoz724g.pdf
    • http://svoytrylend.xyz/company_brand_guidelines_template4lv3z.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_041c4bca5b724233906e58f81b629b25.pdf?index=true
    • https://uploads.strikinglycdn.com/files/deba4f64-1eaa-4b51-892b-a1ba689f13da/a-level_biology_question_paper_paper_3_june_2018.pdf
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_7e5dd41a896b46c5ad3522659d9390d8.pdf?index=true
    • https://s3.amazonaws.com/nonipesikiri/the_alliance_alive_3ds_rom.pdf
    • https://s3.amazonaws.com/zerepuzuze/gasepowozeg.pdf
    • https://s3.amazonaws.com/teximikamukubo/syntax_in_functional_grammar.pdf
    • https://s3.amazonaws.com/nitatotol/joraninunamefokoxefavevu.pdf
    • https://s3.amazonaws.com/dezajok/dragon_ball_fighterz_android_17_playable.pdf
    • https://s3.amazonaws.com/veledabejufi/how_do_i_access_my_apple_icloud_account.pdf
    • https://uploads.strikinglycdn.com/files/7aea80b6-06b8-48a3-bf0a-273c445fe26e/best_grip_exercises_for_rock_climbing.pdf
    • https://s3.amazonaws.com/wuzalugiseto/wikibariwatojozegupuzaze.pdf
    • https://uploads.strikinglycdn.com/files/defdbcaa-a452-4a36-89da-f7514238badf/20804285374.pdf
    • https://s3.amazonaws.com/risalenefazozo/bulodujugujukagutubini.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_off0000fab0.bin
6d8c9c20ab3f6023d9b629353a199bad8770cfa3c8d03c6183f4c4fe41991eaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 5152 bytes
font_01_sfnt_off00010c1c.bin
8f39bb8ce702716af13e30888b8e7497228d31e752ccab758bc499103f6c6ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 10604 bytes

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