Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e306ebc48b6939…

MALICIOUS

PDF

115.6 KB Created: 2021-01-06 12:37:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4e9901e28f69d54115eda6a291270a53 SHA-1: e989434e563eb7778e9afb347462107784c057f3 SHA-256: b0e306ebc48b6939667093e8b178f11f46ea713cde425a29fd186a00b33429d3
252 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to disposable hosting services and a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the link farm structure suggest an attempt to drive traffic to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/aws?utm_term=kaichou+wa+maid-+sama+parents+guide In PDF document text
    • https://cdn.sqhk.co/rolidofajug/hcmjhgg/delikoxasegunifon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455198/normal_5fc28916734ab.pdfIn PDF document text
    • https://wufenimikefi.weebly.com/uploads/1/3/4/3/134366244/kupubenawop-zeverexetuziza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5fdbe553db160.pdfIn PDF document text
    • https://janejamav.weebly.com/uploads/1/3/4/8/134887015/gukuruxewixulil-kinozosariduko-kadotematobinep-rekifad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5f9b01dd91581.pdfIn PDF document text
    • https://vajemedodumuni.weebly.com/uploads/1/3/4/3/134351385/ce93b04719.pdfIn PDF document text
    • https://cdn.sqhk.co/zivudasexoni/OJdaqja/5447131272.pdfIn PDF document text
    • https://gotunodik.weebly.com/uploads/1/3/4/6/134608857/zokofi_tiloj_musifanavedikut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484365/normal_5ff4e2d631bcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475016/normal_5fc2fa518eb07.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/468961e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454673/normal_5feb96b24380c.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/ba77ea2d-ff33-420d-bf6e-a37d0faa0901/david_damrosch_what_is_world_literature.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 30152 bytes
SHA-256: af4d67452f46e135d484d442c37a721ef8d9ef09ab9f3e0238a4744a1751817a
font_01_sfnt_off000185b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185B1 5548 bytes
SHA-256: 5af6244cbfc37f85608e35abed354ba67d141293860c3983775bd330733aab47
font_02_sfnt_off0001987e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1987E 11652 bytes
SHA-256: 98b8241d74a385570828b0c0b9d9bd31756949f161637b1cac1cfa1734781a9a