Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba5d83fbf256524…

MALICIOUS

PDF

91.3 KB Created: 2021-04-08 06:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fc9c0ac706b56a8d7645e457d9eee0f9 SHA-1: c27e1ba7e3997dcef97dc4a8d33bc609762713b6 SHA-256: 3ba5d83fbf2565248980bd8ba66bd001b91fdcf0c49df97251b8eb679160b53e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with at least one identified as a potential phishing lure. The presence of embedded URLs and the structure suggest it is designed to redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=the+natural+lifestyles+reddit PDF link annotation
    • https://cdn.sqhk.co/moturira/i1IKfjb/nhl_games_live_score.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/hgiWcyh/93232918694.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/fiidrDy/15044982813.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/djjhdgc/79811375518.pdfIn PDF document text
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/mifokasawisanup_tewega_mejugiv.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/mefed.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/cgcpmjg/mifujutoxin.pdfIn PDF document text
    • https://vuzabevewipa.weebly.com/uploads/1/3/6/0/136087677/d4f1bf97316e21c.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/hhie9dt/wujetebunewuvanetowaferer.pdfIn PDF document text
    • https://xodobojedabime.weebly.com/uploads/1/3/4/6/134675451/temivi_vapajawazowofek_kunezope.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/nYigojb/jumper_tops_river_island.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_3c0f7ef88da242c1a766d32149f5155d.pdf?index=trueIn PDF document text
    • https://a763ebd9-c18e-43e0-89ad-bff0d4d40701.filesusr.com/ugd/2e16aa_15d49040fb4c4cb6a19867cae08267c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd6c1f2-9746-4117-846a-fa634a9d3853/pixelitir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec32f48-e135-4812-abe3-7bebab59f006/75299233086.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_aca3fdc536a141df86fe046c624085d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ce0331-75d2-41fe-b73a-95969f72b43a/dell_optiplex_755_sound_drivers_for_windows_xp.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_48191065ca0e4d07b447c7df6de0f010.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_f6ebd5b71ee2449aadab9e4ba2fe78a8.pdf?index=trueIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_a9c54d367e7f4531aaecf4e82f938090.pdf?index=trueIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_8ee51504225f48c2b2c199acf50b1391.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_a8b8a08f3e2b4a3e96fa223d0cc245d0.pdf?index=trueIn 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_off00012540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12540 5048 bytes
SHA-256: 37383772276b2bd7b171dc55be82c8b1fd8d684d03b9538d1a690a15925f747d
font_01_sfnt_off00013669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13669 12012 bytes
SHA-256: 5a344f02426b2924242b84dfc75cd86a5310804db5f0169589a856e2f628d89b