Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c35f3f9a8b3032…

MALICIOUS

PDF

68.5 KB Created: 2020-12-22 22:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 84929b8829c9a614d73229943f290407 SHA-1: 9e5e7b2ddb9ab32f03df5101f5377f57e33cb08a SHA-256: 61c35f3f9a8b3032e9380ba2c44e972beb7548511fe40120759c516e612ff70b
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, specifically for containing a large number of external links, including one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains no discernible user-facing content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/wb?keyword=bay%20club%20shelter%20island%20san%20diego%20hotels In PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/benisan.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/vibepurofidenep.pdfIn PDF document text
    • https://dujulofenali.weebly.com/uploads/1/3/4/5/134587776/6272468.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/06cbadc3a78.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/5fc0f33f2cf09257bd6c4f7e/t/5fc1e79418e72e5fdb1cdc1b/1606543253516/38517251167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f18aeb-e6d7-471a-a87a-6ef56e1c36c3/xoruxosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e46bb91-555b-484c-a378-1ef0b530ca71/57190700746.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde97c9d0ff57695e6cefc3/t/5fdf4b847185ee572d592fc0/1608469384751/beauty_and_the_beast_2017_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f5b04a-8ef3-4168-98e1-78acc8f2d3ba/fricker_epistemic_injustice.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1273e403f5353fd9754a9/t/5fc30b55e6d49a06bbf75fe4/1606617967330/bapot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5a50c2-6f9a-401f-9695-aabfa64111d7/33169071904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7625b177-fdf3-49bc-bc2a-4dba78ac95e2/gothic_quotes_for_instagram.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc69a0ee2fce462bcb385cb/t/5fd66459267c8d0ace474b68/1607885914120/30690821156.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdf26493cc064e70de0f0d/t/5fce323c2fa8bc6bcd13908a/1607348797530/zurotitanawenuwobami.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffb1ae9fc3622d51d09b9/t/5fc400bf3570fb44d17f59d1/1606680771863/94443559975.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_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 5492 bytes
SHA-256: 95fd813614fc75c70c39dd517b4b37e0acec44ff08d9803aa757366b82fc9f2a
font_01_sfnt_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 10912 bytes
SHA-256: 3284fb6a7ef7ff0d88736d55abec80e1511d414eeaa5c8fe3c2f65a5f65f3a97

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