Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b7979512a6e9ef…

MALICIOUS

PDF

73.1 KB Created: 2021-02-13 10:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cdf766fc53371b4b415a43df991473d3 SHA-1: 50c40aa9f8e10afe7d6cabe83555bcba4d685328 SHA-256: 98b7979512a6e9efc95b72d8a3cbacd2afec42af4c056f70f3d2709775332506
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The presence of many external links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://maypoin.ru/wb?keyword=2018%20appropriation%20bill%20nigeria%20pdf PDF link annotation
    • https://cdn.sqhk.co/rapekerokemo/cnibicN/teaching_strategies_gold_documentation_examples.pdfIn PDF document text
    • https://bodakipufasedoj.weebly.com/uploads/1/3/5/9/135972884/6dda98115f.pdfIn PDF document text
    • http://ipatovaalena.ru/nifitetipozizujasorexevirml0k.pdfIn PDF document text
    • http://iciko.xyz/10293019981gr09q.pdfIn PDF document text
    • http://mbfsopg.com/music_for_sight_singingxvljf.pdfIn PDF document text
    • http://pop-marketplace.ru/olx_casas_alpinas_em_vendacfm0b.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/ieja2gj/waburojaligukifedunagaru.pdfIn PDF document text
    • https://cdn.sqhk.co/pilimisoduk/eigiljc/xiketuxapawik.pdfIn PDF document text
    • http://xitnet.fun/self_motivation_quotes97n1k.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/jiaThiq/33774886468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_600cf22adad2d.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/IgjXGic/the_walking_dead_nowy_swiat_odc_1.pdfIn PDF document text
    • http://digitalmedialit.com/forugemiziwok7is7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_600da2f5da1bf.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/98265968161iscex.pdfIn PDF document text
    • http://tuimag.ru/java_8_collections_tutorialmvfon.pdfIn PDF document text
    • https://cdn.sqhk.co/kevapaboxer/hs4BLhe/online_calculator_fractions_to_percentages.pdfIn PDF document text
    • https://cdn.sqhk.co/letowajaf/jcGggf3/25459236481.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/ojfQijb/yeewell_smart_wifi_light_switch_installation.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_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 5384 bytes
SHA-256: df5d97d0396fbaaa109eefdfd9c7745417c73bbf120694e3491863fa2f3f8f67
font_01_sfnt_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 10820 bytes
SHA-256: ef8b852e06b8aa52b4e60dae9bf904a14a7adc3dfa762cb5d2719fe3fd2b5371
font_02_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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