Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88d973c8f789b9e…

MALICIOUS

PDF

81.4 KB Created: 2021-04-02 21:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3151aecfd67db95c40f8e3abac92d716 SHA-1: bdb2cd947b3c5ac87c23e3fb1334fcffe4632fbc SHA-256: f88d973c8f789b9eb64a44c09d7bae6ed65098081df6e1615e4bf08c4cb72cb5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=allen+carr%2527s+easy+way+to+lose+weight+pdf+download PDF link annotation
    • https://cdn.sqhk.co/merabuvi/FlJicgi/carrom_disc_pool_mod_game.pdfIn PDF document text
    • https://cdn.sqhk.co/dixobiwi/hd8hhSI/hair_salon_los_angeles_county.pdfIn PDF document text
    • https://cdn.sqhk.co/nupodamukoji/dLChhpU/nasa_report_antarctic_ice_sheet_growing.pdfIn PDF document text
    • http://erethiztzj.space/tujugidinutigufokeparawugnv2p.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/hjsJiff/diy_light_up_full_length_mirror.pdfIn PDF document text
    • http://prizinsta.online/marvel_future_fight_quicksilver_guidev2g9e.pdfIn PDF document text
    • http://manetebanax.22web.org/ghibli_music_sheet.pdfIn PDF document text
    • http://investmag.org/the_grinch_xmas_poemzx51u.pdfIn PDF document text
    • http://itclick.pro/huskee_riding_mower_manualok379.pdfIn PDF document text
    • http://tizadejaso.getenjoyment.net/96829102065.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/Ojjaicb/benji_bananas_mod_apk_v1_37.pdfIn PDF document text
    • http://bujaxodu.iblogger.org/business_model_canvas_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_6ac195cdc74c4ab9a71a0054adfaa849.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavobawum/631918783.pdfIn PDF document text
    • http://fararisujis.myartsonline.com/active_directory_basics_microsoft.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/browser_for_mac_os_x.pdfIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_a250769e436d409e866903e88af63088.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_3c151012c82b4decb1d9183e190e8f07.pdf?index=trueIn PDF document text
    • http://diladamosune.rf.gd/disease_caused_by_air_pollution.pdfIn PDF document text
    • http://patabajisof.epizy.com/adobe_lightroom_free_for_pc.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_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 5632 bytes
SHA-256: 9c4da5b55d59f8d208c9d985675cea79ddeefb4c81f7db9f6f40f520f370e719
font_01_sfnt_off000113a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A5 10668 bytes
SHA-256: 932fc5d0c2cb935f94566c6da198e4a5502faf002aa67ba8cdd51efb5d219d29

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