Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcb7a04016dc9e9…

MALICIOUS

PDF

85.9 KB Created: 2020-12-19 02:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 834acf37a36f453e42ae89215ce1988f SHA-1: 0113983fba0fbe017442cc8dc99c02f96e404cfb SHA-256: 4bcb7a04016dc9e915ea79e11cb90a711eb6d60a7c97acc7f630f36a74fabdb7
304 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and point to potentially malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential phishing or to serve a second-stage payload. The embedded URLs and link farm structure suggest an attempt to distribute malicious content or harvest credentials.

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/fazibem.pdf.
  • 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://cctraff.ru/123?utm_term=continuous+variable+example+psychology In PDF document text
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/fazibem.pdfIn PDF document text
    • https://roxunasof.weebly.com/uploads/1/3/4/3/134312726/140198.pdfIn PDF document text
    • https://nopefulewipedu.weebly.com/uploads/1/3/4/3/134314682/rizogibigumi_lifepubipeto_dixuse_vutoj.pdfIn PDF document text
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/tamewolilak.pdfIn PDF document text
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/rakolimexalikeni.pdfIn PDF document text
    • https://piminuwimizo.weebly.com/uploads/1/3/4/6/134674326/jonive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_5fad8d386db54.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/buzore_netavedow_rijesegaji.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/6741250.pdfIn PDF document text
    • https://sidusumidiwef.weebly.com/uploads/1/3/4/3/134366372/mofuvuzerudavom.pdfIn PDF document text
    • https://julapaxukej.weebly.com/uploads/1/3/4/4/134492969/bakuzogib.pdfIn PDF document text
    • https://guxiwejibu.weebly.com/uploads/1/3/4/9/134902351/pabukomubitelukutibo.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/5b8e5af2-8550-4129-9f56-fe1178c89a17/10928640826.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/tagufebope.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 5624 bytes
SHA-256: 6c58a4dcb1ba97b2c9e74f3e8557eee499ac990a2ad09346936945db8c21d7d5
font_01_sfnt_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 12112 bytes
SHA-256: e9fe37860970743c8296821db2b1a98fa577858e24296aa00711a7a98e1ed9a5
font_02_sfnt_off00013434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13434 16388 bytes
SHA-256: 94845babca49a334c19a2ad16dce95d7f22ce4a4dd1fe13b6ef35749a40b806e