Malicious PDF — malware analysis report

Static analysis result for SHA-256 efacf16d09ff0c52…

MALICIOUS

PDF

80.1 KB Created: 2021-05-08 02:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 695391aec2885782932b17dad7749c9a SHA-1: c70462b9fe62437000c7a6d23dded98e64fc3232 SHA-256: efacf16d09ff0c52adda69a9830260ffddd4e5b2e8c565778287a01b168d1933
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and link farms, indicating a malicious intent to redirect users to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lead the user to a second-stage payload or phishing page. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/strik?utm_term=what+temperature+does+it+feel+like+outside+right+now PDF link annotation
    • https://cdn.sqhk.co/zatugudaxaji/EidjbRy/vikavelopuwu.pdfIn PDF document text
    • http://pakawuwujawo.getenjoyment.net/metafsica_aristotlica.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/ejjJggb/chronicles_of_crime_board_game_replayability.pdfIn PDF document text
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/3174637.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/tecnologie_informatiche.pdfIn PDF document text
    • http://radapox.iblogger.org/sheffield_city_hall_seating_plan_restricted_view.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/Ojhieib/fit_the_fat_2_new_game.pdfIn PDF document text
    • http://jovepodixowofow.mygamesonline.org/old_norse_religion_in_long_term_perspectives.pdfIn PDF document text
    • https://mevemedetu.weebly.com/uploads/1/3/1/8/131871578/tikugun_mifom_tamuzevudo.pdfIn PDF document text
    • https://zuvoxowiton.weebly.com/uploads/1/3/0/8/130813332/tebowegilu.pdfIn PDF document text
    • https://likudone.weebly.com/uploads/1/3/4/6/134681098/feduta_zemisafax_dusite_vizak.pdfIn PDF document text
    • http://vasowenotaruso.22web.org/samonatazubato.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/furiously_happy_jenny_lawson_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/pikuworano/aaheFhb/19588831677.pdfIn PDF document text
    • https://puxorubawi.weebly.com/uploads/1/3/5/3/135349856/ae962926badc.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/4134893.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/hernia_ventral.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/graphic_designer_salary_houston_tx.pdfIn PDF document text
    • http://jasebusezazov.rf.gd/epidemiologia_veterinria_livro.pdfIn PDF document text
    • http://difufoj.rf.gd/kundali_milan_software_free.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/the_animator_s_survival_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/vuduvidukakababetifa.pdfIn PDF document text
    • http://tiwobera.rf.gd/kobekewimoz.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_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 5624 bytes
SHA-256: d190f4cb7ff55c4e0204f988ca8f3b433917b3fbed39b25c0775a7a9f6ead2b5
font_01_sfnt_off00010b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8B 11456 bytes
SHA-256: 3d7935768118d9c75e29467a00e09c322a03ac973dbdc9bf0a68390345a0302a

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