Malicious PDF — malware analysis report

Static analysis result for SHA-256 5721501fe8b19c2f…

MALICIOUS

PDF

78.9 KB Created: 2021-03-22 05:16:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d2d608f29b49238b9d79b77ccb28bfaf SHA-1: 9d0ad87098b117baceb914ecc6873c0de6a93fe4 SHA-256: 5721501fe8b19c2f297ca9cb20273bcea276d7c3397e193ba32ddeda0d529077
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting domains and are flagged as part of a link farm. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to a user manual, likely to trick users into clicking on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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/123?utm_term=manuale+utente+smarther+bticino PDF link annotation
    • http://letnesil.xyz/16748907595oo7yn.pdfIn PDF document text
    • http://titoto.xyz/31068596629gnnds.pdfIn PDF document text
    • http://ewwe.space/jugagugosogasuninubaxu394.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/vizogateweka.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/51201082709.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/67481718009.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/how_to_help_adhd_child_focus.pdfIn PDF document text
    • http://center-about.com/one_touch_draw_mod_apk7lqiq.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/nakuzafol/72527283269.pdfIn PDF document text
    • http://dapizodipe.myartsonline.com/watujemikir.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/work_song_piano_sheet_music.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/bionaire_humidifier_clean_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3dbe5e2-b723-4f36-823a-daa021de8af2/zudape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687f58f3-543d-401e-b2d3-d53c85728908/gonaxuboli.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/pdf_file_reducer_in_kb.pdfIn PDF document text
    • http://wepogevadapafa.atwebpages.com/jurnal_atresia_ani_anak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564db469-5f7c-41f8-90ea-298fcb816a82/uk_food_safety_alert_news.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/nusonabonemomurufigaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20004ee9-34f7-4721-98da-2a532257bf45/13578388368.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/mapewajetakesoxolimapat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff641e2b-7cd5-4127-9c1b-42ea0bbf7159/38292470378.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_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 5184 bytes
SHA-256: 5ed3a8ebed8341623f7902f3551f363cbaea527bf2a156c51cb3a418dc9076ab
font_01_sfnt_off000108a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 11376 bytes
SHA-256: 24fa164fbd4575a374a2012f55eae12cd9ab9259083c94bf8e0e3ed6dadc2578

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