Malicious PDF — malware analysis report

Static analysis result for SHA-256 febc287119a0b417…

MALICIOUS

PDF

73.1 KB Created: 2021-03-02 14:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7b4e0f220a979bcf34fdeb354d579ac1 SHA-1: dbfd27e96df6a3bf690acf152b2933b23a082891 SHA-256: febc287119a0b417098c7cf9cabe3a48e1819f1b90450c59795a110416945ea7
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a site offering 'unblocked games'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/wix?keyword=unblocked+games+the+impossible+quiz+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374540/normal_5feb7e78983c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_5fd6000cb9c06.pdfIn PDF document text
    • https://xufiridib.weebly.com/uploads/1/3/5/3/135346556/1347726.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/pjgheij/sporosarcina_ureae_positive_or_negative.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/h9Arhhu/xesijekidugat.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/jahjjnc/zombie_hunter_full_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388424/normal_6010b3de2c89b.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/XijDnhb/best_history_book_holy_roman_empire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_601b1b42503da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371787/normal_5fccbddbdc66b.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/eFOE97S/ping_pong_rules_singles_serving.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/vebogotexaf/airworthiness_manual_chapter_566.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/cydia_ios_7_free_no_jailbreak.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/21643792316.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/80332993229.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_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 5928 bytes
SHA-256: 3f0d069ba73daed0b1b7a1dd863ec09fe2b7d1c74d33493194c272ba58ad844b
font_01_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 10828 bytes
SHA-256: 058071ee28640d7fb5739ecd76ca12e3b6047fb5aeb7da05a5129ad35d1866ab

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