Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f9969d3800fb88…

MALICIOUS

PDF

73.0 KB Created: 2020-12-21 11:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ecc68d5f1639de4fef462d5cbd45d359 SHA-1: 79794eb505195f9633bbf64dd358fd9e94ba6160 SHA-256: a8f9969d3800fb88b35f9e6a219ae479662d98625c23e3a71122256253adcc14
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics as a malicious redirector and a link farm. It contains numerous embedded URLs, with at least one pointing to known malicious infrastructure. The ML classifier and ClamAV also strongly indicate maliciousness. The presence of embedded URLs suggests an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

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=origami+bird+base+dragon In PDF document text
    • https://bizowubojixix.weebly.com/uploads/1/3/4/2/134265373/2323671.pdfIn PDF document text
    • https://xolitosoxi.weebly.com/uploads/1/3/4/5/134583661/89d03cc87700d1c.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/gotake_vobakekel_kumajepunodan_ronikodaf.pdfIn PDF document text
    • https://dodotutole.weebly.com/uploads/1/3/4/7/134764587/eca5186e35a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc38de88787e879897caab0/t/5fc3fcf8f8cdb769c65f0e04/1606679804600/we_have_the_mind_of_christ_scriptures.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd39d2109152533653190d/t/5fddda88d85ca26442f1cffa/1608374924243/solar_system_planets_information_in_english.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc77c7848c1673e559d28c7/t/5fd72eedc4373837b925204e/1607937774552/399685763.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/smith_wigglesworth_books.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/sunghoon_lee_joplin_mo_fax_number.pdfIn PDF document text
    • https://s3.amazonaws.com/lanowilovuviwib/introduction_to_elementary_particle_physics.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51f41c30a162e0c6ddaa3/t/5fcb5fdebce7087d1adc1a50/1607163880822/gisaxukixurov.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/fitaserimenalu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1559bc6d9645836252c59/t/5fc3f3307acac6192a3aa5f9/1606677296465/45506527379.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10523b8467722f1d4eb82/t/5fc7f771dd0d500205be158c/1606940529471/biwamaxifowujupanore.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/home_access_center_suhsd.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf48c3ca23154c95aa511/1606218893066/lebanon_middle_school_pa.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_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 5280 bytes
SHA-256: 2781c75a6b26e5fa8fc981e5e2eaf82cfa7185de6d2c6d5795421e22e2617388
font_01_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 11188 bytes
SHA-256: 39ac37e48aa6e1ec8c7ebf3057b6fd87cccae8364b52159a5144258d52bf72f0

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