Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95b493a9c3b31c2…

MALICIOUS

PDF

129.2 KB Created: 2021-05-24 01:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4e79dc002c79d117f2f0cdee9e47f8f5 SHA-1: 4b8e6ef36e8ba5b7e70f37f0cde22aba368e9ac3 SHA-256: e95b493a9c3b31c29feffe7f5ea12a9008c2a395463b391c57d095c52d71bdcf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically identifying this behavior. While no scripts were explicitly extracted, the presence of numerous external links suggests a potential for redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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/strik?utm_term=neoclassical+age+in+english+literature+pdf PDF link annotation
    • https://dovizitozul.weebly.com/uploads/1/3/1/4/131408131/binufodutubosi-xapad-fexunuwikop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5fe1140ba67ca.pdfIn PDF document text
    • https://wadomojare.weebly.com/uploads/1/3/4/4/134472746/412667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421944/normal_605ace9a7fbcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377125/normal_5fc8c46a80183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_6049f00c25374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488817/normal_60234b6b811b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473023/normal_604d6c6495182.pdfIn PDF document text
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/a7d0edab.pdfIn PDF document text
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/gopedavalazuw-nuwunaxanopuvuw-gutadufen-gevadu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366976/normal_5fff69efc0492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e12270-d665-44c9-a169-871e9305b2be/violin_finger_pattern_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a96a6c-1026-41ab-a1ea-12b5cbd4354c/60940193956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7298b1cb-be3d-4015-98f6-ca161236d0be/how_to_clean_head_on_dyson_v11.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/64022057546.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/music_theory_for_dummies_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4889e4d4-9fda-49ca-bb8c-0013a8e80d33/100_square_chart_interactive.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/apa_references_website_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/789be21f-2d67-454f-9daf-855ccba09cc9/ejercicios_de_rehabilitacion_para_trombosis_venosa_profunda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a21ba9b5-357c-4198-a62e-2a7092a980e8/employee_performance_appraisal_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a0e07a-68e0-4e8a-9258-6adb74b700eb/dunkin_donuts_vanilla_chai_latte_ingredients.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2096de2-649e-4089-9954-f54dd72b94d3/11230845134.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/popular_christmas_songs_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/kalojep.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_off0001b768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B768 5388 bytes
SHA-256: 19ea11f04add8292e0c16f858152f5082acec809cf6e880318c44aa0a376b08d
font_01_sfnt_off0001c9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9B8 14528 bytes
SHA-256: 2ac16b6f1f4d4a93883f2e4a7b9827524e6df1f46197ee66ad2be31a67ea4c6d

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