Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc56ebe275ab36e4…

MALICIOUS

PDF

76.3 KB Created: 2021-04-05 16:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 68efeeecb5fa80fa722ec9633e1a2b10 SHA-1: a72b9d00ad55608b5db9c5a3b3c891261dc2433c SHA-256: fc56ebe275ab36e4b34c17dec54e658ba2e27337025a689fc331f679b7d20b56
214 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a mass of external links, indicating it is designed to redirect users to potentially malicious websites. The heuristic firings, particularly 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', strongly suggest a link farm or SEO spam campaign. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gimoguvi.ru/award?keyword=abc+song+music+sheet+pdf PDF link annotation
    • https://cdn.sqhk.co/gulaxemetila/KjjzhjY/88745426946.pdfIn PDF document text
    • https://cdn.sqhk.co/revikokelobu/nXUHBOD/which_continents_made_up_laurasia_answers._com.pdfIn PDF document text
    • http://damenetapep.iblogger.org/hannah_arendt_totalitarianism.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413125/normal_5fc7f17a8d5f1.pdfIn PDF document text
    • http://detonic-deutschland.website/99266913571ndbjm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5fe283bad9708.pdfIn PDF document text
    • http://testersairf.xyz/an_introduction_to_genetic_analysisf0ius.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/ghSiggj/gobijijipod.pdfIn PDF document text
    • http://remontnatali.ru/bose_901_series_2_equalizer_manual92a2w.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/VQB25hf/driving_licence_exam_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/VLXLTja/shark_world_game_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopetemiwi.rf.gd/xibukevojosodimozululiva.pdfIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_41a7a21da094451b97fc59de8f91829d.pdf?index=trueIn PDF document text
    • http://rufofexejojar.epizy.com/zatavemexusamimaxase.pdfIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_cf1a0ceb68044676816db5693e9d611d.pdf?index=trueIn PDF document text
    • http://lanogiwelo.rf.gd/doh_anti_smoking_campaign.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 5360 bytes
SHA-256: 54a2b3157770756b5196114bcccb245b1f2c00bbef2acfd6d87f6cce088ff32b
font_01_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 10680 bytes
SHA-256: 095a150ae765af8e9e7a18cd5185361f1539dea23ab7611e319c49b91a610cf2

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