Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e10740833f2a74…

MALICIOUS

PDF

76.8 KB Created: 2021-03-26 06:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 932323c93793a2058d5ffb76a7ad4bcc SHA-1: 2c8c81301cdaaa6eb6993287055121c45d01b35a SHA-256: b7e10740833f2a74079a817541e144fe7787cbce2ff46cb8cd6395a1ca9f22e2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including those on disposable hosting and redirectors, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata suggesting it is presented as an 'answer key', a common lure for malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/123?utm_term=adjective+and+adverb+phrases+a+answer+key
    • https://wajegeteb.weebly.com/uploads/1/3/4/8/134896445/dosawil-valojizi.pdf
    • https://cdn.sqhk.co/goworonol/ajd3Ygi/charades_words_medium.pdf
    • https://static.s123-cdn-static.com/uploads/4486566/normal_6001efdd8e960.pdf
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5fff575d9f5c5.pdf
    • https://cdn.sqhk.co/jemowevu/jchbtig/90321956825.pdf
    • https://cdn-cms.f-static.net/uploads/4427783/normal_6046c18c20cf8.pdf
    • https://static.s123-cdn-static.com/uploads/4450041/normal_5fe4fc5b01f93.pdf
    • https://static.s123-cdn-static.com/uploads/4376600/normal_5ff7601f121af.pdf
    • https://cdn.sqhk.co/jomurozop/XKicVwG/skyrim_alchemy_health_potion_recipes.pdf
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/wigomunuxu.pdf
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/b338146426ac6f2.pdf
    • https://static.s123-cdn-static.com/uploads/4403807/normal_5fdfa8d457221.pdf
    • https://pusenosate.weebly.com/uploads/1/3/5/3/135347115/ca485836f26230.pdf
    • https://cdn-cms.f-static.net/uploads/4366027/normal_6047f283c2782.pdf
    • https://cdn-cms.f-static.net/uploads/4470832/normal_60481e949b175.pdf
    • https://cdn.sqhk.co/bibikodazit/jgggthd/84923735890.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pasutiz/tablayout_in_android_github.pdf
    • https://s3.amazonaws.com/dubiditiginowo/types_of_triangles_worksheet_super_teacher.pdf
    • https://f270a619-8d23-4dc9-95fa-a4320df4b75e.filesusr.com/ugd/7bd364_efef29ac20f94dfab6b0859b9db4b3c7.pdf?index=true
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_98e7f0b1bdcd41729be2956ab8efc96c.pdf?index=true
    • https://c721cda0-4280-4afd-9fa5-b6cfbe496abe.filesusr.com/ugd/cbe325_f0ff41b722ec40edab9a875043d72873.pdf?index=true
    • https://s3.amazonaws.com/vibuvomomuv/ailesa_album_video_song_isaimini.pdf
    • https://s3.amazonaws.com/ganubifirigevi/94085590471.pdf
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_68f986ff7e1441938d51646b9634e886.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9d.bin
e77aa06d9fe36d2545185b306d0bc76f0b510fba7242bbb4a5b37ce74201daf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 5652 bytes
font_01_sfnt_off000101e8.bin
18bfbe27aa3f25102801058e1dd538eb8baac6a82be5ed365299d46c58898dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 10472 bytes

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