Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b57563688250778…

MALICIOUS

PDF

71.9 KB Created: 2021-01-12 13:35:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 54a361186c975231646211754b2f66fa SHA-1: 9b0498c97aa529fbca401e574d1cd9f75e684d7e SHA-256: 8b57563688250778001034f6e9fd1e056f35bd68f2b2108bf368e9d593488b8c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous links suggests a link farm or phishing attempt designed to lead users to malicious infrastructure.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=pathfinder+bard+arcane+duelist+guide In PDF document text
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/4374276.pdfIn PDF document text
    • https://site-1241869.mozfiles.com/files/1241869/lambretta_shirts_size_guide.pdfIn PDF document text
    • https://site-1176413.mozfiles.com/files/1176413/zelurebezeb.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/ejjgexw/sokisedibijujin.pdfIn PDF document text
    • https://site-1175399.mozfiles.com/files/1175399/tabletop_trees_for_christmas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_5f96c647d93ab.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/5430621.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484818/normal_5feb4f2973926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495058/normal_5faa2cc7a6f1a.pdfIn PDF document text
    • https://site-1176739.mozfiles.com/files/1176739/xikevos.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/xilasisefi/choke_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/risekoxozipewozap.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_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 5424 bytes
SHA-256: 32992619dc71ccd459d7e6f6543fb02da3d4922fd3e38e74da360e4d2e7d642b
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 9952 bytes
SHA-256: a002c6c7aa9c30e180ec801c3c29bc1289d67e84a0e007e6a2a7df1b48f63768