Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcec17dbea490821…

MALICIOUS

PDF

76.2 KB Created: 2021-02-10 01:31:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9ef10a2736a9700a0aef9dec603b16aa SHA-1: 6afcc09df740cc9596fee036a7e0bd58c4e42ce2 SHA-256: dcec17dbea490821ce540d314e908b889f4358b2a2b0b17502bc6787e7ed3b31
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a coordinated effort to manipulate search engine results or distribute content. The presence of embedded URLs further supports the malicious intent of directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/aws?utm_term=logical+connectors+pdf PDF link annotation
    • https://cdn.sqhk.co/lovojekaboxi/ib1iiK9/jatiribupekisuzosasot.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/libujiq/23877760936.pdfIn PDF document text
    • https://cdn.sqhk.co/dejenuluzew/hchgggM/climbing_plants_for_fences_australia.pdfIn PDF document text
    • http://raftgjgr.space/dazibisorugedenofrur6.pdfIn PDF document text
    • https://puxibaso.weebly.com/uploads/1/3/0/9/130968956/8818221.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/ibjhhMu/gomubono.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/idKhfge/84092975310.pdfIn PDF document text
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/faguxek_burusujozi_vesagonuriwumiv.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/WihYjcc/solar_system_diagram_to_scale.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/jidZrVi/3963836664.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/hjd1jKu/funny_captions_for_selfies_with_best_friend.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/joxeveveromagekilopon6bmau.pdfIn PDF document text
    • https://cdn.sqhk.co/sufokorume/iieyZMl/app_assistant_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/amjgVmp/butunifebuvixikamigipe.pdfIn PDF document text
    • https://cdn.sqhk.co/paparidew/hfAgdbN/boss_fights_ark_genesis.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/8WgeiiI/zisawagawevusotujeliriwat.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://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_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 5052 bytes
SHA-256: 1de73e94442824e230dc62d5bf48fadb505e146cdfd85a81964a261d052ffad2
font_01_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 10268 bytes
SHA-256: d833dabcc93b87a2280863fa5c253efeea78c05525c7e0a8a9c2ae8667221696
font_02_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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