Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82ea786b5bbf027…

MALICIOUS

PDF

69.2 KB Created: 2020-12-16 21:15:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6a65bc93a1077067b8d6fad1ece03382 SHA-1: 8d3ac33e328ad5e281d2402a9b451927e176ef54 SHA-256: c82ea786b5bbf02711e57c4c868fc8b33604cefc2b54950137c3fe65ab65bcb9
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link and a link farm. The embedded content, though heavily obfuscated, suggests an attempt to direct users to external URLs, one of which is known malicious infrastructure. The presence of numerous links to external PDFs indicates a likely attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=songs+about+college+love In PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/7390632.pdfIn PDF document text
    • https://vukibawurop.weebly.com/uploads/1/3/4/6/134601902/delabudapigovev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f9506c503ce8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b3de69-9650-43e7-acd7-6980b1bc35f0/revit_design_options_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e11beed-b4f5-4631-9ba9-a754a3a40d83/jegepezuziromaweletemoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca39d900-aacd-4015-b179-d8493ef25202/donuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429af9d2-b6b8-4c91-ae47-b753b7ca0995/political_science_book_in_hindi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/skillshop_google_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/c_d_p_o_full_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d156c89e1c4b8fe05cfa/t/5fd231d7ebc7ce75e8bcdcfd/1607610839430/rivaxutidaximuzosexif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b82ae70-10ed-4052-8768-7c146e60ea79/what_is_the_moon_on_snapchat_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ee0a07-8b98-4c06-a1f4-a1f7a5a07711/ribodexutabesizujogelu.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/check-_list_para_el_diagnstico_empresarial.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_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 5172 bytes
SHA-256: 579f8e7e8ea6b105f4eed050fd058ad6cca54608ca45607864bcc42cbf8e59ba
font_01_sfnt_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 10456 bytes
SHA-256: a315f7f2fc0da721672f48ade40e823c36ca06738226fb5a1c1a911444697476

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