Malicious PDF — malware analysis report

Static analysis result for SHA-256 318ec76c78179847…

MALICIOUS

PDF

77.4 KB Created: 2021-01-26 03:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fcca5a39556f68dbccfa7ba59faf31f6 SHA-1: b1a8cbcf9c284aa42cf314abfbc0d60d54b67857 SHA-256: 318ec76c7817984776d62b23714413ad2da4440677172b44988e18f0920a3c23
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate a malicious redirector and a link farm, suggesting the document's primary purpose is to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest a phishing or malware distribution attempt.

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://traffmen.ru/123?utm_term=cra+exam+study+guide In PDF document text
    • https://cdn.sqhk.co/zetikitor/Jgihbic/jusakoripog.pdfIn PDF document text
    • http://depupejaxidolip.22web.org/wijobugibopok.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/iejajjO/zafisijiwajibobefivikof.pdfIn PDF document text
    • https://sobapeseg.weebly.com/uploads/1/3/1/0/131070394/3d23d179289.pdfIn PDF document text
    • https://foxufaba.weebly.com/uploads/1/3/1/4/131482874/girobinanuveso-benurijoju-rufesopebuzada.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/0118fc7.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/gjhf8o4/guzamotokajesodabuj.pdfIn PDF document text
    • https://zojubexetiw.weebly.com/uploads/1/3/5/3/135316795/8c6996138de6.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/rebomedug/vulesebudurobupuvupa.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/76256037484.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/30356875209.pdfIn PDF document text
    • http://xifusejikudit.rf.gd/gutugoved.pdfIn PDF document text
    • http://remofexemuja.rf.gd/kritika_the_white_knights_awakening_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/tablighi_bayan_in_english.pdfIn PDF document text
    • http://xebizeluzifavi.rf.gd/charles_crook_ordenadores_y_aprendizaje_colaborativo.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/19991718023.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/apple_airport_express_windows_software.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/instruction_manual_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/jixefusotodabewuluz.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/autopsy_digital_forensics.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_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 5188 bytes
SHA-256: ca5c073f19bda5018a0d975d12da271af341622ee4bfeef510e91ce4c140bfcd
font_01_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 10240 bytes
SHA-256: d6c30ab0267bfbbb215774d6b4eb6bcd791d1877289fa42cfb98a747ee4ddf1b

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