Malicious PDF — malware analysis report

Static analysis result for SHA-256 adca8ca2beca9f97…

MALICIOUS

PDF

86.8 KB Created: 2021-01-12 11:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bb72c4d389b55abb62366f17e720a73b SHA-1: 08dcdf4c38c302cce90d4cd061e24058463f95de SHA-256: adca8ca2beca9f9785d22e34cf6d4ad3bceb3e58f6439d436a5c2a0e943d54d4
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 sqhk.co, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure (traffine.ru), and another flagged the PDF as a potential SEO link farm. The ML classifier and ClamAV also strongly indicate maliciousness, consistent with phishing or malicious redirection tactics.

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://traffine.ru/aws?utm_term=costing+sheet+setup+in+d365 In PDF document text
    • https://kinofipu.weebly.com/uploads/1/3/4/7/134725163/danupodofevevexim.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/BjKKhi5/24560339932.pdfIn PDF document text
    • https://sozipufejelaj.weebly.com/uploads/1/3/4/3/134352325/3e29c18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_5fb744ddd83eb.pdfIn PDF document text
    • https://cdn.sqhk.co/tesikotuk/f0hfgci/under_my_spell_song.pdfIn PDF document text
    • https://vajibenutiw.weebly.com/uploads/1/3/4/4/134487234/b0a087bf053.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/rutemifobemofaso.pdfIn PDF document text
    • https://kapukafasid.weebly.com/uploads/1/3/1/4/131437878/2970060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_5f8ce99a4de16.pdfIn PDF document text
    • https://jiwefirufij.weebly.com/uploads/1/3/4/3/134370204/7cffe77d5da176.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/ropidadegaxut/fanuc_arcmate_100i_programming_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/uglydolls_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/finch_bird_images_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/triangle_congruence_and_similarity_worksheet.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_off00011611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 5228 bytes
SHA-256: 2d262903bad221121ba34e53f992a3672cad047d71dd27f2304c73efd71fa2e4
font_01_sfnt_off000127dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 11188 bytes
SHA-256: d321bf9a378ce3bf8c330e1356a10c08c233ba15914ea99841bbc6fac38f5d51

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