Malicious PDF — malware analysis report

Static analysis result for SHA-256 490f821dff19c43e…

MALICIOUS

PDF

74.6 KB Created: 2021-04-08 04:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c189402a910cc52e1ca5004c555a423c SHA-1: 78f254d8efe0c7de5375761d13d402ab25cc0532 SHA-256: 490f821dff19c43e3896505fecba08470050737848070ec8603c702189acce95
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The presence of a 'utm_term' parameter in one of the URLs suggests tracking or phishing intentions. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://jacksth.ru/strik?utm_term=dead+until+dark+book+cover PDF link annotation
    • http://fetesitomer.mygamesonline.org/biology_chapter_13_review_answer_key.pdfIn PDF document text
    • http://vibemezanolex.mypressonline.com/luzitusukop.pdfIn PDF document text
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/piduserujesi-joreku-wavedidejuguli-repak.pdfIn PDF document text
    • https://rigepapesoruzu.weebly.com/uploads/1/3/4/5/134519565/zixokosafeduxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_605df34979c7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_5fe92195f16e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_602ee3699f54d.pdfIn PDF document text
    • https://kujepilam.weebly.com/uploads/1/3/5/3/135343620/a490e.pdfIn PDF document text
    • https://ronunute.weebly.com/uploads/1/3/1/0/131070227/762111.pdfIn PDF document text
    • https://kipewupariwigel.weebly.com/uploads/1/3/1/3/131379586/difojuwesun_nekon.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/2006_honda_civic_ex_coupe_third_brake_light_replacement.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/nepenane.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/lunoxewuresepo.pdfIn PDF document text
    • https://diboboxu.weebly.com/uploads/1/3/4/3/134330346/vijidolujuzobomogefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_6016ad0d016cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_3f03b7bf6f894c66841f29a4e4251e20.pdf?index=trueIn PDF document text
    • http://sazebufaz.atwebpages.com/force_field_molecular_dynamics.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_720de4ed5ff74b4d9bbb20329a7e51db.pdf?index=trueIn PDF document text
    • https://eb7ae0bc-69c2-4833-8adb-ed465737bb77.filesusr.com/ugd/23493e_b7b9ebd68f894a2a8960a756eeb0e9c3.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_e8fb777c91424c97871bf3eefce5eae5.pdf?index=trueIn PDF document text
    • http://xejobutek.onlinewebshop.net/admirvel_mundo_novo_aldous_huxley_download.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_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 5020 bytes
SHA-256: b8d4b4df18b53385661015d1d5901b723d4426964ded56e4d31ea31a8d7ebc7c
font_01_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 10456 bytes
SHA-256: 107cdc3566b8e99e921d0ae8810f21d06164d6d039f60180bb3aa8577e2625dc