Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffb093f33d7f1e0…

MALICIOUS

PDF

72.1 KB Created: 2021-01-20 07:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 033274b9edf58927661d12b337d09630 SHA-1: 9728fec1fe0f26d47f77ce7342f853e2422c2fa5 SHA-256: 4ffb093f33d7f1e0a6e3531e3f458f74ca89469d55daef44cfd0ce2e69a57751
184 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malware distribution sites. No scripts were extracted, but the presence of malicious links is sufficient evidence for the attack pattern.

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.
  • 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://gettraff.ru/123?utm_term=accompanies+soil+conservation+worksheet+answers In PDF document text
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/ef7aa34a0b13a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5ffb595cd644f.pdfIn PDF document text
    • https://site-1191329.mozfiles.com/files/1191329/xogatedaze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5ff1dfe95c1fb.pdfIn PDF document text
    • https://site-1168202.mozfiles.com/files/1168202/koduxukagotakum.pdfIn PDF document text
    • https://site-1174866.mozfiles.com/files/1174866/ridelugenajodoguk.pdfIn PDF document text
    • https://site-1171718.mozfiles.com/files/1171718/zotemizadelugumasivizami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470692/normal_5fe92f5e2d91b.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/rutibujeduza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5fe8dbb2d0691.pdfIn PDF document text
    • https://vuzodafolo.weebly.com/uploads/1/3/4/7/134732359/fatozogefar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404745/normal_6003cfc09d628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_5f91c46732331.pdfIn PDF document text
    • https://sumejuloluguwir.weebly.com/uploads/1/3/5/3/135390827/4296305.pdfIn PDF document text
    • https://mafupalitofix.weebly.com/uploads/1/3/4/0/134042392/lanewejituto_lifuzigox_jekixurip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_5fab9c2d0197f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485929/normal_5ff1cb4763306.pdfIn PDF document text
    • https://vizazifikoj.weebly.com/uploads/1/3/5/3/135327449/d53154e86a8dc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rutipozi.epizy.com/mahi_teri_chunar_dj_song.pdfIn PDF document text
    • http://bonizeza.epizy.com/xatobimumafatowemuki.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_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 5376 bytes
SHA-256: b5afbdd6a32077c7427c65ce4126248f09145dd1664c596451ad716fa35f5c11
font_01_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 10604 bytes
SHA-256: 2c0ad542c97b729bff19e9558546635c76275325e2c6a8879d4f246a09f8b800

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