Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9bbc37d2bed4e0…

MALICIOUS

PDF

79.2 KB Created: 2021-04-04 02:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 837c63b1903e38f0a91be81e7b5da176 SHA-1: 4dc3d43c4c2e7c63316db5273d401034553c0e18 SHA-256: aa9bbc37d2bed4e09f5db09854ce3e54f6fcc6567f7ca4958827416e28b7be62
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Maplestory 2 mac' and 'wkhtmltopdf', suggesting a lure for users searching for related content, directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=maplestory+2+mac In PDF document text
    • https://cdn.sqhk.co/zujumatatub/Roejdhd/pro_slingshot_shooters.pdfIn PDF document text
    • https://nikudedixipapun.weebly.com/uploads/1/3/4/6/134692686/9944356.pdfIn PDF document text
    • https://kaxapanokatonab.weebly.com/uploads/1/3/1/0/131070327/3b6c578f.pdfIn PDF document text
    • http://belkwigs.com/91248272838oz4ha.pdfIn PDF document text
    • http://my-favshopd.online/git_rebase_command_explainedqiibs.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/kokasijixekivukexuto.pdfIn PDF document text
    • http://instahelpforbusiness.com/que_significa_tener_granitos_en_el_glandertwd6.pdfIn PDF document text
    • http://lunesygets.xyz/26677910618khxo9.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumila/0ihhaia/54650118066.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/6jhPgjx/miro_clash_royale.pdfIn PDF document text
    • http://vuwulaviwu.iblogger.org/57741739998.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/ORifrge/baby_shark_dance_world_record.pdfIn PDF document text
    • http://lg-copyright.com/loganalagapavenu12ig5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gufogima.epizy.com/how_to_do_fishing_knots.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/36715499072.pdfIn PDF document text
    • http://karuserewojax.epizy.com/chord_progression_midi_free.pdfIn PDF document text
    • http://rufojovig.rf.gd/19846650455.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/is_the_walking_dead_comic_book_over.pdfIn PDF document text
    • http://roxegut.rf.gd/86850895484.pdfIn PDF document text
    • http://gawisibo.rf.gd/paulo_coelho_adultery_book.pdfIn PDF document text
    • http://wamitut.epizy.com/betelorizasisa.pdfIn PDF document text
    • http://debarunuzijabe.rf.gd/juwujedabanudusijire.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/sap_crystal_report_13._0._22.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 4952 bytes
SHA-256: 47169de48158b56110937cf1104dd54c6540795c2dbb7feebbef1712d1c0679e
font_01_sfnt_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 11152 bytes
SHA-256: cff313daed4bbf6daa60d0243f3ab8da29d11a1f9871796544445c25e69b9ef0
font_02_sfnt_off00012188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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