Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c311c0a3a3bc18…

MALICIOUS

PDF

129.2 KB Created: 2021-03-25 18:04:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 55a4aaad84affb0e8ef2c5e4f1b71398 SHA-1: 66a9c2b22a4c855f46eb137f8136a75c21fe0bbc SHA-256: 20c311c0a3a3bc1815bf453709db074cb9fb8860402870f1e3ad21857acf8ff5
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URLs, one of which is a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a 'solutions manual', aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=statics+and+mechanics+of+materials+solutions+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454550/normal_5ffb5bc608276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458163/normal_60542de15f4da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_5fc71b7b6d35f.pdfIn PDF document text
    • http://differencecheats.net/marks_mechanical_engineering_handbook_free_download34ev5.pdfIn PDF document text
    • http://13millions.store/54808654656cov93.pdfIn PDF document text
    • http://namelesssouth.xyz/olvidar_preterite_chartrjjr2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460975/normal_60538df4022cd.pdfIn PDF document text
    • http://laura-egorova.ru/40123458870xxiu9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_6037e11b2c3b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485810/normal_6020a3cbd16c1.pdfIn PDF document text
    • http://bokusikeze.iblogger.org/54453459388.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5fcf5f2419acb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_60180da2077ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kogisovaf.epizy.com/vozoxofod.pdfIn PDF document text
    • http://xetemap.epizy.com/xorebuno.pdfIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_0838656eaa3f491fa220f0842e851319.pdf?index=trueIn PDF document text
    • http://namulamix.rf.gd/5805677075.pdfIn PDF document text
    • http://zawemitop.epizy.com/what_does_the_uncle_sam_symbol_represent.pdfIn PDF document text
    • http://vesoromu.epizy.com/ancova_example_problem.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_21abdf17c0cf43a487362a19db107a84.pdf?index=trueIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_7c8cb4705e794d0085f09fbef942b071.pdf?index=trueIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_5cc302f49eda4706b82259dbe3a54188.pdf?index=trueIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_c6a56223b53445c1ba49c629f62fdef6.pdf?index=trueIn PDF document text
    • http://gudanomakorake.epizy.com/46960294187.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_off0001b7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7D5 5500 bytes
SHA-256: c9659b46908f7c75689bf35ecb7a725d2ef17bc46ee142c5809c7c10da1c6be3
font_01_sfnt_off0001ca59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA59 12860 bytes
SHA-256: 3745ab7ab2c7ff36b66856255fdf1429e3436e6a0dd43de8eb4ba159f16955de

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