Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f037cf53c30592…

MALICIOUS

PDF

75.1 KB Created: 2021-03-23 21:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b30ebaba8cacda905bcce46a1607c42e SHA-1: 53a63ad4e45d00c48e4256651734f6f1da4c05cb SHA-256: 47f037cf53c30592cceb410fb59a15efc8242d470669bef4b522a42f023b946c
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://kuzutuzo.ru/aws?utm_term=how+to+reset+fault+codes PDF link annotation
    • https://wuzizado.weebly.com/uploads/1/3/5/4/135401221/211aed.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/629b52a1d1f185.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/cXAPBWY/sakura_school_simulator_halloween.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470222/normal_5fe1c4ea2235c.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/FHBDMje/difumapape.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471686/normal_600256d95f58b.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/WW7B3qR/yeezy_350_natural_outfit.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/077c7e.pdfIn PDF document text
    • https://vazarilixigoro.weebly.com/uploads/1/3/1/6/131636807/pusepolaruren_xukutixakufo_gixagojoxuv_ledosiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_5fd1d239dea76.pdfIn PDF document text
    • https://zogomidovuga.weebly.com/uploads/1/3/1/6/131636914/c78dd919f6d6.pdfIn PDF document text
    • https://cdn.sqhk.co/welosezu/ggf9Gia/avatar_roblox_skin_free_boy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501993/normal_60478c2f05005.pdfIn PDF document text
    • https://kipobibupu.weebly.com/uploads/1/3/4/3/134367270/1170934.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_6c835efd152d47b5af69aa41b6555a76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pogolo/twitter_integration_in_android_example.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/music_video_s_sites.pdfIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_3f42b31dbb844fcc833abdafcb7a3aa2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xisefowu/entone_remote_guide_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/antioxidant_activity_of_honey.pdfIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_9dd756ea541040faaaa985664dd46827.pdf?index=trueIn 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_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 5068 bytes
SHA-256: a3c1ea3f7372dac4357acec6d5419844f56f59b247bdd96d94c068f5e2de06e1
font_01_sfnt_off0000fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 10440 bytes
SHA-256: 00df942ed8a026ef827e9d7301472984fc72ebc63e045b6f90165e2a0e3cf0f6