Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c8e14c8f0e5e91…

MALICIOUS

PDF

73.9 KB Created: 2021-01-03 18:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a4bf0146b7b67131586e0a810073b58c SHA-1: 7ea29b8bc6cd6d515d07511750c0e545b030d000 SHA-256: 07c8e14c8f0e5e91e70bf7dad7339d8869ff999a21f6e60866fb4d7b0cc3b260
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains heuristics indicating it's a malicious redirector and a credential phishing lure impersonating Facebook. It directs users to a malicious URL which hosts a PDF, likely to download a second-stage payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/feff2f1.pdf.
  • 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/123?utm_term=average+centipawn+loss+grandmasters In PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/feff2f1.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/dhdrggd/gexejujugotikaborejatenob.pdfIn PDF document text
    • https://cdn.sqhk.co/rosafipex/ihdhIgh/96373829185.pdfIn PDF document text
    • https://retariluwefise.weebly.com/uploads/1/3/4/8/134858211/72a820adc8.pdfIn PDF document text
    • https://jarajegixam.weebly.com/uploads/1/3/1/4/131437089/b1f8225132a22a3.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/jjJie8I/fazozafaduzik.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/00d12fc6-59b6-4a9e-af39-cbaf86e90775/tebokizifu.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/26246664796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab67b13-4950-4150-ab00-70c5f78a02d6/timotanexazipigoduma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435bf028-d15d-4ec6-a719-1d653b7e7b84/convocatoria_de_asamblea_ordinaria_e.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_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 5532 bytes
SHA-256: c7b21c546cfea2559582c9fd73eed58fd4ccbb903dd0954085620d16f9836d6c
font_01_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 11140 bytes
SHA-256: 50fe602c10e3146005ac66e07d57d7cb7133011c305b458eeabe67c48c5c7c9c

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