Malicious PDF — malware analysis report

Static analysis result for SHA-256 15deca70c9f0c710…

MALICIOUS

PDF

82.3 KB Created: 2021-04-12 19:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ae67added8b7e7df00483611c89d44ac SHA-1: edf633deafbd5e88524e19e3be3533594e5c7f1d SHA-256: 15deca70c9f0c7108cac1a4d4b1813439770187d42f2326f6f7dbc24310d2839
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/strik?utm_term=what+does+if+you+play+your+cards+right+mean PDF link annotation
    • https://vojitimene.weebly.com/uploads/1/3/4/5/134596684/f15bb765ee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_6012dfd883088.pdfIn PDF document text
    • http://zetajazonigifa.iblogger.org/41881557877.pdfIn PDF document text
    • https://lesavudipuvu.weebly.com/uploads/1/3/4/3/134338744/9b8317.pdfIn PDF document text
    • http://paxawujaxoda.22web.org/bailar_in_the_preterite_yo_form.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/zevev_repigiv_kagapat.pdfIn PDF document text
    • http://safagiko.iblogger.org/sameworopomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483338/normal_6011eead3b09f.pdfIn PDF document text
    • https://wijugiretatito.weebly.com/uploads/1/3/2/8/132814958/pinibara.pdfIn PDF document text
    • http://gomirakapo.22web.org/easy_guitar_songs_for_beginners_chords.pdfIn PDF document text
    • https://kadefevexenikoz.weebly.com/uploads/1/3/0/8/130813118/1164415.pdfIn PDF document text
    • https://pesowisigafu.weebly.com/uploads/1/3/0/7/130739627/b7b327ef.pdfIn PDF document text
    • https://piworanup.weebly.com/uploads/1/3/2/6/132681558/abac0f724b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_0d5789aec47143b59ad07e4583eaf8dc.pdf?index=trueIn PDF document text
    • http://vekojimiginerep.rf.gd/free_book_folding_alphabet_patterns.pdfIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_4e4001a9ebc04cfe8aea5d3bff760a64.pdf?index=trueIn PDF document text
    • http://wakezebudege.rf.gd/25650526740.pdfIn PDF document text
    • http://labimovoguduwej.epizy.com/how_to_fix_roomba_charging_error_1.pdfIn PDF document text
    • http://gajiwudozu.epizy.com/syeeda_s_song_flute_sheet_music.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_3800cd3a71f34682acac27fad0265786.pdf?index=trueIn PDF document text
    • https://2ed9768e-82a7-41f7-bc91-4b86d8d7aa0f.filesusr.com/ugd/bdbd91_3c66169db60d4277bc45107306a1da5c.pdf?index=trueIn PDF document text
    • http://duzunop.rf.gd/80179160678.pdfIn PDF document text
    • http://lirepemewepe.rf.gd/times_table_from_1_to_30.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_off0000fe82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 5684 bytes
SHA-256: da63bc64c2087bff85dbc9b7feaa85a58bed98aa79a271d8e619e1b039217aff
font_01_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 11784 bytes
SHA-256: 08be8c99670300b07ae51250527ff94dd03de19a8c00c02b278cbb766b592af1

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