Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc447dd5529fc818…

MALICIOUS

PDF

68.7 KB Created: 2021-03-03 14:22:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d5cb257bc228d82372372f655b665da2 SHA-1: 770a0b09988800fc13c0054a01684f6636915c38 SHA-256: bc447dd5529fc818a228d2089bec33ca07604897fa4bce072367ecee69cc5ad6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs that redirect to link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Google sites' and 'wkhtmltopdf', potentially used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/wix?keyword=google+sites+6666 PDF link annotation
    • http://nazhivy.net/14237464001fr6s6.pdfIn PDF document text
    • http://cardio-natural.info/rexemobtr5id.pdfIn PDF document text
    • https://cdn.sqhk.co/rifibimilo/ghjgSxi/12209704341.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/yghVgYq/pokewagaxusoz.pdfIn PDF document text
    • http://shopwithsale.website/51811241910kjcm9.pdfIn PDF document text
    • http://fullstacket.online/who_is_gary_vaynerchuk_wife7lwtb.pdfIn PDF document text
    • http://bufo.online/2895656730rv4xo.pdfIn PDF document text
    • http://bobr.space/riliwepapoxibelibuwesodc4qi.pdfIn PDF document text
    • http://betmoy54.com/i_hope_youre_ok_meaning_in_hindix3u7u.pdfIn PDF document text
    • http://mikrotikwizard.com/azar_application_freeheeyd.pdfIn PDF document text
    • http://pannochki-art.com/dell_optiplex_790_motherboard_bios_update8gq03.pdfIn PDF document text
    • http://svoydvalend.xyz/12353669506gsexf.pdfIn PDF document text
    • http://mmmuuuue.space/8219204807lme5w.pdfIn PDF document text
    • http://my-credit.info/nifurudiyyny0.pdfIn PDF document text
    • http://copyrightram.net/ncert_books_for_class_7_mathso95d9.pdfIn PDF document text
    • http://samo-katim.ru/population_pyramid_stagesjxz0b.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/bhbMig8/69142501664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5fe50d97017d4.pdfIn PDF document text
    • http://stingeksoj.online/46033623024sqr34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 4732 bytes
SHA-256: d3c1c47976619fa37bb427dc9e44726853eecab1ba8ac290ae8f92c26363bedd
font_01_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 10472 bytes
SHA-256: a6c795b19d0d2296b8c8365dcc7f2c4b1eddab8538f723fe6922398ed2c22a22

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