Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6ac307ecad0e9e…

MALICIOUS

PDF

81.4 KB Created: 2021-04-13 09:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f8ed7e6aab6dae55604aa1a41af2d293 SHA-1: 9fa5bb8a5bfa137ef735eb1d66720d489c1e2494 SHA-256: ad6ac307ecad0e9e27562601d261cb3d6da4b89872436e71fa8e725acfece77f
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 pointing to disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The presence of an embedded URL and the ML classifier's high confidence further support this assessment. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jottigo.ru/strik?utm_term=tenancy+agreement+early+termination+clause PDF link annotation
    • https://vejupurujiku.weebly.com/uploads/1/3/1/6/131606174/tevidesumigamuk-zizetebu-tabakekegoza.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/gghi1if/30033697345.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/iimAigZ/target_promo_code_electronics_october_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xogutozo/bNidtij/19423995215.pdfIn PDF document text
    • https://dodoxatufasiw.weebly.com/uploads/1/3/2/6/132681482/dolizajowubomobige.pdfIn PDF document text
    • http://ru-order-687646765445.art/8335430595653ei2.pdfIn PDF document text
    • https://cdn.sqhk.co/pobojatizopa/h0lijnx/popipopa.pdfIn PDF document text
    • http://save50it.pro/is_a_rain_barrel_worth_itca4ao.pdfIn PDF document text
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/zovuraminoret.pdfIn PDF document text
    • http://sendgrid-de.com/zozakugufutebodadujituju33zx.pdfIn PDF document text
    • http://arevakar-travel.com/vocab_workshop_level_c_unit_2_synonyms_and_antonymsofbx6.pdfIn PDF document text
    • http://vladport.ru/dirt_devil_royal_5006zust.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_c59ca640ee5a4b169319515ad830b38a.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_21a2e78e0d7d4c90be2f6dd81b2efa1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/spreadsheet_to_keep_track_of_monthly_expenses.pdfIn PDF document text
    • https://36ba0bd5-485c-4bd5-924f-6a5e18dcb854.filesusr.com/ugd/96419b_96dee6c1e80d45f68e5338e69af52897.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xesigeze/kuvasazasesovidiz.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/capsule_endoscopy_billing_guidelines.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_e75e6ea37b6b428eb9c340b29d3f3a5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luborinizu/hawaii_five_0_season_9_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/bhula_na_sakoge_video_song.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_fa6dea1700854319bd68668a6912518f.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_dfc825e002854b56bebf8f30a9a7d4f7.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_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 5172 bytes
SHA-256: e297243b3fec2ed11fae348682029ab3be8f696bdd5741207975828c47973c14
font_01_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 10520 bytes
SHA-256: e8f7aa9f1890b79ccd370b3f0e435f11a64011a43a634c47a235e29a1c06bec5