Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4784dccf8097c35…

MALICIOUS

PDF

71.3 KB Created: 2021-02-16 02:49:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4d88670937cee02dd6e9ebb731b93fdf SHA-1: 9cf349a33efa6cf4463e4e6642dd59267aa89a33 SHA-256: c4784dccf8097c3518236e770efe5be268d77fdd98c78e888e6c6321a16e3813
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/wb?keyword=microsoft%20sql%20server%202014%20books%20online%20download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476122/normal_60105dbc33d1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_5fd6a7def3eb7.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/0uijejf/crazy_russian_hacker_house.pdfIn PDF document text
    • https://gapidegit.weebly.com/uploads/1/3/1/3/131379699/5558276.pdfIn PDF document text
    • http://falutaburifa.iblogger.org/sipixemuka.pdfIn PDF document text
    • https://cdn.sqhk.co/duravukikemo/egh4gjq/dc_comics_characters_harley_quinn.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/7402546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_6022a5b4a8c29.pdfIn PDF document text
    • http://gudazugaxogipo.22web.org/jaaneman_chupke_chupke_movie.pdfIn PDF document text
    • https://sulagumafiwez.weebly.com/uploads/1/3/1/3/131383207/2d8278d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fde457a07f12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402956/normal_5fe4648d70524.pdfIn PDF document text
    • http://xeboxemovev.66ghz.com/lejedi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcaf4a4af5ef.pdfIn PDF document text
    • https://vorufiduwesonuf.weebly.com/uploads/1/3/5/3/135314955/4604573.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388412/normal_600909b41ccc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5fccd054c2527.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/2812977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxosam.rf.gd/95360287355.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_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 5916 bytes
SHA-256: 4b6613825a46563625b6254efb7d48cab1b447b01b048f3c2634528dab83cae7
font_01_sfnt_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 10808 bytes
SHA-256: 70b295520629ec7ad62c90dbb3f306989517ee1ffb53d149f758375982a748ca

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