Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f69b0536c1103f0…

MALICIOUS

PDF

77.4 KB Created: 2020-12-17 23:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b7294047e16696e303f1e20902b34aff SHA-1: 27e0a4ae6751bf978c8d82e864409d026ed4b272 SHA-256: 8f69b0536c1103f07271802f26983f5beef273b00af5b758f4452c99ce4eefd3
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, and it contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Ritualistic sacrifices plague small town'. The presence of numerous embedded links, many pointing to S3 buckets and other file-sharing services, indicates a potential link farm or phishing attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/strik?utm_term=ritualistic+sacrifices+plague+small+town In PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/laresisif_kigadebokenub_bajutinerid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421210/normal_5fb362f53bd62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5f94760e4c153.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/henghuili-files/testy_angielski_b2.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/nagetonofanifomo.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/54888725719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ad0d55-2acf-42ff-a322-f0301ed5244a/73353732411.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/66956867925.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/a_room_of_one_s_own_themes.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/learn_korean_book_free_download.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 5436 bytes
SHA-256: 3ee0f8145ba27e3adda33103e46c9a49592989d12e169ae0408009ea3f11b2a4
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 10616 bytes
SHA-256: 648529b9e3081101eb1f77a268106c7dfc248c74297d57499f36c64f003151c6

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