Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c05ac403f629d1e…

MALICIOUS

PDF

107.1 KB Created: 2021-03-21 01:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 64109786e7bd4d4738a390e89db9a098 SHA-1: cec0a47014264041e06c6e9b87a1352d9e8a88d7 SHA-256: 7c05ac403f629d1e9aef311f3f99e9d6ed52027c9090d03bd29afdd977cec637
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=avian+anatomy+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484383/normal_6004963e965b3.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/lazuxoniwufajigogurogur.pdfIn PDF document text
    • https://kidogotetivi.weebly.com/uploads/1/3/4/3/134375399/2914273.pdfIn PDF document text
    • https://bitusuverutito.weebly.com/uploads/1/3/1/8/131871453/8256f.pdfIn PDF document text
    • https://bakusiluvusefe.weebly.com/uploads/1/3/5/3/135309983/8680043.pdfIn PDF document text
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/2791148.pdfIn PDF document text
    • https://xatuzagu.weebly.com/uploads/1/3/0/7/130738971/547e9330.pdfIn PDF document text
    • http://babbieshop.ru/majasevapekeponamislxkq8.pdfIn PDF document text
    • http://magnetfix.store/simulation_of_full_wave_rectifier_using_multisimox4zm.pdfIn PDF document text
    • https://nepejudakolop.weebly.com/uploads/1/3/4/8/134876169/nulazinomamo.pdfIn PDF document text
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/repizixibenovomixi.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/22291879520.pdfIn PDF document text
    • http://dvestideyli.xyz/xaxenarezifapowusimep7qly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421354/normal_5ff0ea73b59a8.pdfIn PDF document text
    • https://furamakivagoj.weebly.com/uploads/1/3/0/8/130814247/tojujipi_kofab_fegobena.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/what_is_the_average_age_of_als_diagnosis.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/curso_de_finanzas_personales_gratis_unam.pdfIn PDF document text
    • https://xupajipodiburut.weebly.com/uploads/1/3/0/8/130814024/dunanajotiluzuga.pdfIn PDF document text
    • http://kompledom.com/rival_crock_pot_scvc600_manualrd5et.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_601d9f96577e8.pdfIn PDF document text
    • http://technodom11.com/cyberpunk_2077_ps5_version_free_upgradeeqtmz.pdfIn PDF document text
    • https://nifiguxo.weebly.com/uploads/1/3/1/3/131398563/vakumasirisopoka.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/ruzaganog/single_bed_fitted_sheet_cotton.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/bsc_nursing_syllabus_baba_farid_university.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/65215168919.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/bootstrap_3_form_horizontal_left_align.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/light_blue_formal_dress_short.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_off000163f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F2 5156 bytes
SHA-256: 97aac6ddb86a079acd03057b7d0b7aa3cb581ee5f490aa31d51fd8a3c46dd821
font_01_sfnt_off00017596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17596 11964 bytes
SHA-256: df397f68397064a1d096a8c510bc959c0d4b7b562218e60e221ada067f5f8d58