Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb79831b6c2b11b…

MALICIOUS

PDF

74.5 KB Created: 2021-05-11 17:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1857932eb477f6fa896ea620f7f9d3f8 SHA-1: 0208a82757a18f4654d269a01b5655a8ed64c0c6 SHA-256: ffb79831b6c2b11b6ac6e441c297038edee7d18b7c3c7e0b26a49762e34e58bf
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 hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=quran+in+english+pdf+yusuf+ali PDF link annotation
    • https://cdn.sqhk.co/datujisukebe/hfEjgOc/ruvavuniga.pdfIn PDF document text
    • https://wixuzezokanozav.weebly.com/uploads/1/3/4/6/134663812/8119550.pdfIn PDF document text
    • https://wugupuvexiso.weebly.com/uploads/1/3/0/9/130969254/3907440.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/7ibCoji/cinemark_paraguay_precios.pdfIn PDF document text
    • https://likuwamagu.weebly.com/uploads/1/3/4/8/134899286/piwin.pdfIn PDF document text
    • https://cdn.sqhk.co/lewuravasu/VUscqAt/download_gravitybox_minimalist_physics_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/icifgg9/unicorn_novelty_pet_bed.pdfIn PDF document text
    • https://cdn.sqhk.co/rogudokives/fges0GL/glitch_lab_android.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/jgdjfjd/spectrum_poweramp_visualization.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/Wieifij/5530687573.pdfIn PDF document text
    • https://kabolonopatine.weebly.com/uploads/1/3/4/2/134265344/6d11bbbe95035a4.pdfIn PDF document text
    • https://cdn.sqhk.co/tifomogoketu/0vOiege/laser_overload_3-_25.pdfIn PDF document text
    • https://cdn.sqhk.co/kikepedu/igpchgo/67956247368.pdfIn PDF document text
    • https://bowixasexagat.weebly.com/uploads/1/3/4/0/134041419/rufupopuf_tilafi_fufejip_xotekufaka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pugegexu.rf.gd/donation_page_template_free.pdfIn PDF document text
    • http://labopum.rf.gd/mos_capacitor_nptel.pdfIn PDF document text
    • http://judenagu.epizy.com/90897470897.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_095742ade1a24b0d90c9d6608ca8aab9.pdf?index=trueIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_643e928f02f744248bb7d6eafc4ceb96.pdf?index=trueIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_1b113fae22bb40768e8faf6f7fc87055.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_b9907578dd6c428095618ade91ac1b7f.pdf?index=trueIn PDF document text
    • http://dukiduzafenej.epizy.com/brain_teasers_interview_questions_with_answers.pdfIn PDF document text
    • http://lagamifex.epizy.com/car_sale_agreement_template_doc.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_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 5468 bytes
SHA-256: 0abf6ab127251821a72d3b7027a885b4a9bae51bcb3f714c1e11898f6abcb067
font_01_sfnt_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 11544 bytes
SHA-256: d63111d0cf68bbaaea07d39a1c2fa8e7c7c362d2533f4c215d3e5ef81eb5cd4b