Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08d7058c7e80be4…

MALICIOUS

PDF

60.8 KB Created: 2021-02-15 17:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 779f8c3bb5f4bdcdb262efabd55883f5 SHA-1: 65faeb3ab0ccd4f140245d1e6b18e11372a9b9ab SHA-256: c08d7058c7e80be412df33333ea310b6512e4eeab6a2bae1305bbdff4dc6cdbe
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent. The document body, though heavily obfuscated, contains a title related to 'the most dangerous game story packet answers' and references wkhtmltopdf, indicating it's likely a crafted document designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/wix?keyword=the+most+dangerous+game+story+packet+answers PDF link annotation
    • http://vejofewi.iblogger.org/proportional_relationship_questions_and_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486535/normal_5fca70d6be9f5.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/xPhjIhh/amino_undertale_download_apk_pt_br.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_60290cf387444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_600c99c134578.pdfIn PDF document text
    • https://cdn.sqhk.co/fejukomus/KjeH2wR/dual_citizenship_in_usa_and_australia.pdfIn PDF document text
    • http://vikusegapaf.22web.org/gerd_treatment_guidelines_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392237/normal_5ffaae049ff7f.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/e8niigk/kikkerland_music_box_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5fc713111a67b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/manual_de_administracin_de_empresas_claver.pdfIn PDF document text
    • http://jejotatimub.rf.gd/77027691607.pdfIn PDF document text
    • http://wekidezeze.epizy.com/58512578591.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/new_assamese_song_2019_video.pdfIn PDF document text
    • http://wefazor.epizy.com/78126939979.pdfIn PDF document text
    • http://weguxuwe.epizy.com/juges.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_off0000b1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FF 5664 bytes
SHA-256: c47f895ea8ff69593c0ed24d094775b2d5c11cd9ec009a73b2d573e0f9b12176
font_01_sfnt_off0000c52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52B 9736 bytes
SHA-256: 238e47a1bac02717c1d2c4ddfb0b14ced40b8b3df19498daf569f6453de29f89

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