Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ffdcfc16d8272c…

MALICIOUS

PDF

80.4 KB Created: 2021-01-07 09:35:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 998914653ac0361f052c0650cd905cb0 SHA-1: cc94b46e1d733aac7959f72a1401e348472175bf SHA-256: c7ffdcfc16d8272c76284ab0251af6d2dcc5d521992ae9474a5082d6f72fe2b5
244 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malicious redirection campaign. It contains a large number of embedded URLs, with several pointing to known malicious redirectors and disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the extensive link farm suggests a focus on external redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=webster+collegiate+dictionary+pdf In PDF document text
    • https://cdn.sqhk.co/ponesigis/oijxZhe/super_funny_ringtones_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/D9q5Sje/63438417252.pdfIn PDF document text
    • https://kifewuwumezoduk.weebly.com/uploads/1/3/4/7/134740170/cebe1.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/kakegibefokow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5fae91b234b7e.pdfIn PDF document text
    • https://takimibovejexi.weebly.com/uploads/1/3/4/5/134512521/5478439.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366034/normal_5ff0272397a5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382958/normal_5fae1077547a3.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/hfwhfSU/derifesaduzudewevu.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/jzhhpJK/bonusemezugejowukufogo.pdfIn PDF document text
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/1a9355fd.pdfIn PDF document text
    • https://nezuwiwobitedut.weebly.com/uploads/1/3/4/6/134600585/gavanojurafog.pdfIn PDF document text
    • https://daxulidotuviwo.weebly.com/uploads/1/3/4/5/134597057/tunojugafumowat-sajil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5f90fda594a88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421051/normal_5ff4d2bf8cb1b.pdfIn PDF document text
    • https://zelowomuguzak.weebly.com/uploads/1/3/1/3/131379017/toviw-butimonafufutel-zezijebilesi-zawol.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/0d63b4e6-a519-4706-b142-f0c545a1c6c2/47461058785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e453c986-e1b4-4b89-af51-7c8469e31799/ordinary_serum_for_acne.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_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 3256 bytes
SHA-256: 6ae99337c50e20d84f78e78984f13dae9dcecfd6b6220f1bb42646d9a9b28084
font_01_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 5576 bytes
SHA-256: 3b2912ef222c4f1ce66ac87c0d33ea23bc59abde6f1126b9d2d1f1228b31b37d
font_02_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 11160 bytes
SHA-256: 6cb489586211b3660b893a89fc9178f93b3740a5fc2f75c531d689b7d286ba60