Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26027a52c938c25…

MALICIOUS

PDF

81.0 KB Created: 2021-02-21 17:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 57118201c26f9ab88a6d6f34a2b854d5 SHA-1: 6fcfcdade68e742fa8f59940d436a88bae1142db SHA-256: d26027a52c938c25121a12b4899586288cb8153b24a90b2b22facc5fb9f2d49b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on services like Weebly and S3, suggesting a link farm or redirection strategy. One critical heuristic identified links to known malicious redirector infrastructure, and ClamAV detected it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains text related to 'unblocked games 77 ssf2', aligning with the lure of providing access to content while redirecting to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=unblocked+games+77+ssf2 In PDF document text
    • https://pimuvetu.weebly.com/uploads/1/3/4/6/134635596/9144070.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/seposugid.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/4750611.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/jfjijhR/97915407832.pdfIn PDF document text
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/6386296.pdfIn PDF document text
    • https://punoburewi.weebly.com/uploads/1/3/4/3/134305970/5744329.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/yVehbfj/xorefu.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/401f55f8.pdfIn PDF document text
    • https://bupimapigi.weebly.com/uploads/1/3/1/3/131383283/ropedoji.pdfIn PDF document text
    • https://finijigif.weebly.com/uploads/1/3/2/6/132681422/mifimupulej.pdfIn PDF document text
    • http://kusulapezep.iblogger.org/vokulubiniga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://femodizabofowu.epizy.com/como_atualizar_o_android_j7_prime.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/wuwabikid.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/forecast_balance_sheet_artinya.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/24192898008.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/paid_civil_judgments_on_credit_report.pdfIn PDF document text
    • http://xafaxeko.epizy.com/company_brand_logos_quiz_game_answers.pdfIn PDF document text
    • http://fonimegalidoxu.epizy.com/37723417517.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_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 5652 bytes
SHA-256: 07bcf5fff5b72428913f60adc13d521ce63532ac5ba015cae76b61c24662269a
font_01_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 11720 bytes
SHA-256: a1b1b08ef3fb6c596d6ab6602f4b1b358afadb4a98521ccfe5b5a393cff499cd

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