Malicious PDF — malware analysis report

Static analysis result for SHA-256 53042aeeef800508…

MALICIOUS

PDF

77.0 KB Created: 2021-04-14 11:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 474281bbdcea00b5171dab5704063af2 SHA-1: a789609a2eb5a5de7ed0312844ef331c3185ec40 SHA-256: 53042aeeef80050812177238694dab355c5077b873cbdab2d2f6885f9d6bb103
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/strik?utm_term=imovie+mac+ipad+sync
    • https://cdn.sqhk.co/tivuzofep/Ygc5idJ/guess_the_word_quiz_with_answers.pdf
    • http://bukawavado.medianewsonline.com/xodujoboroxok.pdf
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/mumetixi.pdf
    • http://fetesitomer.mygamesonline.org/pizimuranawasakuz.pdf
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/4661091.pdf
    • https://gukamixi.weebly.com/uploads/1/3/4/0/134042495/bofakolase.pdf
    • https://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/63cde3664b.pdf
    • https://cdn.sqhk.co/pumevigatare/g7uA2Ge/damage_report_form_doc.pdf
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/bozubajekevugilepuki.pdf
    • http://zujejilolo.scienceontheweb.net/diforejotevov.pdf
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/jabitudejifuna-raleribuneregi.pdf
    • https://razitesewiwi.weebly.com/uploads/1/3/2/8/132815022/luton.pdf
    • https://cdn.sqhk.co/tobijoge/Biivjes/11608470253.pdf
    • https://lurafavef.weebly.com/uploads/1/3/0/8/130813461/gagidelediwukob_fisubomifenonib_moruzo_matexonadajapen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/defipedibe/bemisonaloluxapusupi.pdf
    • https://s3.amazonaws.com/minegikukovel/76868412574.pdf
    • http://porimab.epizy.com/8781863961.pdf
    • http://watusatuvor.myartsonline.com/risc_v_instruction_set_manual.pdf
    • http://desakoda.rf.gd/there_to_be_simple_past_exercises.pdf
    • https://s3.amazonaws.com/nasitevu/horoscopo_del_profesor_zellagro_para_hoy_escorpio.pdf
    • http://gixopiv.onlinewebshop.net/20543974598.pdf
    • http://mutidulofof.epizy.com/canadian_food_guide_serving_chart.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee79.bin
c9ec49253b68de97fc80a1396c0330ae91ae0e4a16febdc3ca3a93f8ba90e09d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 5192 bytes
font_01_sfnt_off0001001c.bin
30ee6a6d9795443ed245b42acc0211bd38ddfb8569b34d2de797fd254f626c3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 11356 bytes

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