Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6e1673c457eb54…

MALICIOUS

PDF

81.3 KB Created: 2021-03-17 19:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b4b4207e7b399378f1ac5ca4e26dff78 SHA-1: edda25627dbc6e6a9da3711ad0f56d4ae9987aa0 SHA-256: ed6e1673c457eb5405729ede08b6c264ff6cc62849497d8a465b0a6c73e29fbe
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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/123?utm_term=bubble+bubbles+game PDF link annotation
    • http://parhelifrl.space/united_states_military_rank_insignia_chartqkdbi.pdfIn PDF document text
    • http://forpost-electrica.ru/naxomafevuku0iwpa.pdfIn PDF document text
    • http://mrt-zdes.ru/fisiwezisexixemozadopifa3svg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5fdc6abe0d7da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_6010461e91db3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_600cdfa888b7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_5fd631aa57c78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480408/normal_5fe0858af0cee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367944/normal_5feafba001c2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_5fc8723c7b03f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_603bbc029282b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391303/normal_6051ad80e0e7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f98b6e-0b54-4a8b-a294-60d35be93ea1/voviritukusujonorizine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c045dd5-c027-4c07-9266-eb15b1c2f669/nupofazik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eace80d1-4af4-477f-b4cf-4f5b57762812/51891821104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724b7658-9140-4f5a-af87-a3a5eb614380/what_streaming_service_makes_the_most_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc58681-792b-4d82-a940-34974bd6d83a/la_la_land_piano_duet_sheet_music_free.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_f023d5deb5b142fca40e97773d004ac2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/730e1518-c23b-4b28-a6a3-4381bb4f7f2f/16236572856.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_2992e36426ed46dc84d190b869083387.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59694436-d7d6-42fe-a4cb-be9adc4032f9/juegos_del_hambre_2012_pelicula_completa_en_espaol_latino.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_a30770f7762149cd85b2b67d38d63bf2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c950107-5225-4422-9d1c-c61513bc76b4/62805528433.pdfIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_dbce15cfe8f14ae98d5c2b224f26c74f.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_087b3758a6854413b0fc921d2dd92c4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/845a91d6-7370-41d7-9bf3-36922506ea62/somewhere_over_the_rainbow_original_ukulele_chords.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_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 5100 bytes
SHA-256: 5e0ebdabf2b9192bace6cdbf1e12ea1772ba0349c36b70261fbb8eee4dc629b8
font_01_sfnt_off0001106d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106D 11496 bytes
SHA-256: a0a25263538399478a25aceb7cd222ede35cd303a46499534d26178a24f615d3