Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eb09f331975001…

MALICIOUS

PDF

83.3 KB Created: 2021-05-20 03:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: df6a9af1b946d1345ccf00381f3ab5e6 SHA-1: eb2845be537d0fcfb4684b7d4fa3eb21379c949e SHA-256: 88eb09f331975001c6d4d85cd4452ebb621f825742f2fb59ded561f3213a2268
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO spamming operation. The primary malicious URL identified is https://golowaki.ru/strik?utm_term=malayala+manorama+newspaper+pdf+today, which is likely used to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://golowaki.ru/strik?utm_term=malayala+manorama+newspaper+pdf+today PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411246/normal_6055a3c76083d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_601b7e232c7e0.pdfIn PDF document text
    • https://suveruwifofe.weebly.com/uploads/1/3/1/3/131380558/2991942.pdfIn PDF document text
    • https://zozijopese.weebly.com/uploads/1/3/3/9/133997316/8792268.pdfIn PDF document text
    • https://lolapozunit.weebly.com/uploads/1/3/4/5/134592397/53d2eff7cc3de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495686/normal_5fe832ae2e864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_60343cae21815.pdfIn PDF document text
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/papipij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393370/normal_60061011f3f4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390659/normal_5fc84b9458dc5.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/papejupulunol_jujud_wawebi_kuxoxow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/schwinn_active_20_recumbent_bike_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f752385-ef79-4946-a350-83c29b40b4fc/beats_solo_pro_review_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/new_odia_mp4_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4c720b-6bda-48bc-a078-74c5581fa51c/77739037160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37347c2c-ab0e-4854-a028-9f36e7eac576/how_to_reset_nook_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcac5882-259d-4ef3-848a-f6d42e54153e/10553974954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c12eb64-3323-4cd2-abd2-3609c0df5c2d/35328001335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927a13eb-782c-4813-a622-db07263387a9/24410325753.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/vaxib.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/23316889718.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/trabalho_em_uma_transformao_isobrica_exercicios_resolvidos.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 5388 bytes
SHA-256: 6c6ee9ed137bf1670e4a70e30bed1411cf1206a63ba064796d5f74443b9e8aa3
font_01_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 10812 bytes
SHA-256: db4d3070f734eb69260d41c4caa92c89bfb080bdba1a07e622bc385b311e6773
font_02_sfnt_off00012a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1E 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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