Malicious PDF — malware analysis report

Static analysis result for SHA-256 37344c22eb231edc…

MALICIOUS

PDF

113.5 KB Created: 2021-03-14 06:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 646d64c0e9e51124ba6c8a1994f06ef4 SHA-1: ee7445cc383431d823d1c6ade6efba572e839e3b SHA-256: 37344c22eb231edc2b3ac17ee434f9b6edef8de4c4ea5dc52d57bb5112db55a6
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bologen.ru/award?keyword=orientacion+psicologica+definicion+pdf PDF link annotation
    • http://veviwumifuvemuz.mypressonline.com/arithmetic_reasoning_notes.pdfIn PDF document text
    • http://help-copyrighteamservice.com/bihar_board_12_admit_card_20198jcm8.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/what_tablet_is_ce0168.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406456/normal_5fc6804168708.pdfIn PDF document text
    • http://italia-doc.fun/list_four_components_of_unconditional_positive_regardxl4br.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/kenmore_elite_he4_dryer_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_5fe63c4eac2ff.pdfIn PDF document text
    • http://samo-katim.ru/xumidixf8oz.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/what_is_the_purpose_of_informational_text.pdfIn PDF document text
    • http://55571.ru/55799316959tt181.pdfIn PDF document text
    • http://zubiki.top/safety_first_everfit_car_seat_safety_ratingsgfl2w.pdfIn PDF document text
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/ralukisaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382778/normal_5fe15cf315487.pdfIn PDF document text
    • https://gamitodotabezoj.weebly.com/uploads/1/3/1/4/131453651/8766440.pdfIn PDF document text
    • https://ritukananikunid.weebly.com/uploads/1/3/0/9/130969552/sokuguku.pdfIn PDF document text
    • https://mifopubulu.weebly.com/uploads/1/3/1/6/131637027/xorakuviwerunulu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_a592f61e292b4ddfb83cb0499141c74c.pdf?index=trueIn PDF document text
    • http://jalijoruki.atwebpages.com/timijunofixetilakewu.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_b24902ff575848d2bd0d67e72b0f8758.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_61c60074291f48fcbb99c79d6d7c9410.pdf?index=trueIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_f857a8a215b44d1695035d82a512ae06.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D3 5136 bytes
SHA-256: 6d2b4cb45c62d9e98c1af176b0b2750ae99190e10c666d6cdd747c58b148ca37
font_01_sfnt_off00016b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B50 12144 bytes
SHA-256: 6a7bbad8a0cccc208741057f1167c90a2e9dcfb39f4360c9bb0e08504d13adf0
font_02_sfnt_off0001931e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1931E 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off0001a84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A84C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2