Malicious PDF — malware analysis report

Static analysis result for SHA-256 86855e99a4edfe6e…

MALICIOUS

PDF

75.2 KB Created: 2021-04-04 13:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1135e61deda95e9835e6f8b4fa8ae0ff SHA-1: c4ac3ff41a28a58f5a97682805fed01127f09db0 SHA-256: 86855e99a4edfe6e6f96e55c3ef53d5a23708662dc9a9da47b44a85b574895e0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a link farm on disposable hosting, pointing towards a phishing or malware distribution scheme. The document body, though truncated, mentions 'best books for beginning bodybuilding', likely a lure to direct users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=best+books+for+beginning+bodybuilding PDF link annotation
    • https://cdn.sqhk.co/zezetemirag/eDnYSGf/infinity_war_comic.pdfIn PDF document text
    • https://pefojefevofat.weebly.com/uploads/1/3/4/6/134659321/magevowakowogu_xibimos_bazujin_ferumulozokumat.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/polaris_360_pool_cleaner_hose_assembly.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/private_practice_cast_season_5_episode_12.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/Ggg1ic8/homemade_yellow_cupcake_recipes_from_scratch.pdfIn PDF document text
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/lulavasuzig-pisuto.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/gjBZcdF/xumotanimalobuvitenedig.pdfIn PDF document text
    • https://fanejutasoja.weebly.com/uploads/1/3/5/3/135399707/luvenokarigekis.pdfIn PDF document text
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/2314875.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/lumozazizusej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xijejuvi.myartsonline.com/66580684340.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/tratamiento_de_absceso_cutaneo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3adaac-e6a0-4946-82b0-1bf71c86ed0d/royal_envoy_campaign_for_the_crown_level_53_walkthrough.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/accident_incident_report_form_qld.pdfIn PDF document text
    • http://ropedeni.epizy.com/full_form_of_arpanet_in_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/95789334455.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/razozajavuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955994da-5b77-4eff-9ee3-2b86a1417249/18628025755.pdfIn PDF document text
    • http://gajutovowitexij.rf.gd/mepafabok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/728acea2-12d4-421a-86a8-00e4e0bd2f60/how_to_use_humidifier_for_plants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bacdd236-8b89-4868-b64d-8f0d3ab4349c/why_did_the_us_want_hawaii.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_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 5220 bytes
SHA-256: 2923ed464818d2f612e6fa3402c1ddd8613344fcefd5bb332dc5c7089632dfc5
font_01_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 11248 bytes
SHA-256: d3ae19e5e16103d982bd64b8a9e0ffcf60c35a86cc82edb1e8511cef5fb27662

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