Malicious PDF — malware analysis report

Static analysis result for SHA-256 be270fd3d53f4998…

MALICIOUS

PDF

75.1 KB Created: 2021-02-28 02:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f7adb68503abdaaa3c7228b5f2ce2bf5 SHA-1: 73622000d1a4ed9f2baf034c9221ac743a32f5d1 SHA-256: be270fd3d53f4998921d3391ec957f309dc7c430df8c65eff5fc5fe8185f1d91
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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://kuzutuzo.ru/strik?utm_term=navy+and+marine+corps+awards+precedence PDF link annotation
    • https://nofixemi.weebly.com/uploads/1/3/6/0/136082439/rotibuw.pdfIn PDF document text
    • https://nemapawa.weebly.com/uploads/1/3/0/9/130969411/rovolifizotix_bikoleda_baroxapere.pdfIn PDF document text
    • http://berabujadew.22web.org/vegetarian_diet_chart_for_weight_gain.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/dbNggid/disazovexewu.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/hih0Njh/54868793273.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/nedijizobe.pdfIn PDF document text
    • http://minoduzu.iblogger.org/jaseraniwopojokeki.pdfIn PDF document text
    • http://tuzazigigub.iblogger.org/razovisutizu.pdfIn PDF document text
    • http://liketsven.xyz/definicion_de_calidad_de_vida_segun_la_omsjgeoe.pdfIn PDF document text
    • https://cdn.sqhk.co/lemijexo/gfhaXgf/girukiz.pdfIn PDF document text
    • https://kuvakikarubefi.weebly.com/uploads/1/3/1/3/131383404/2311cf786724c14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwejozaz.epizy.com/2015_dodge_challenger_v6_performance_upgrades.pdfIn PDF document text
    • http://wijijatalil.epizy.com/honda_fit_aria_2007_sale_in_sri_lanka.pdfIn PDF document text
    • http://zenuvivasefum.epizy.com/wisegitabivifotimuti.pdfIn PDF document text
    • http://zavufomagug.rf.gd/army_of_the_dead_sub_indo.pdfIn PDF document text
    • http://larukanogut.epizy.com/fazajewixajuxedasemeloka.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_off0000e6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 5412 bytes
SHA-256: eb5a289a2075d75bb12a59e4dde9caefcf2e16ff0a23368be20740520915d291
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 11112 bytes
SHA-256: 303fc2783922afdfb76014b92708261e23a91a096c6bf2d82b692da98ee90efd

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