Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8e2ef38d29d93f…

MALICIOUS

PDF

82.1 KB Created: 2021-04-06 12:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 27b07206269f5982c051c855208ebe30 SHA-1: 508873358d367b6d88d0739b764fec1aa749b44c SHA-256: cd8e2ef38d29d93ffeb378c299831263035de6d70b30b0acfef4e1197a3e8ad8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=indian+vegetarian+dinner+recipes+for+weight+loss PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490251/normal_6055f0dc0c13d.pdfIn PDF document text
    • http://new-leggins.site/31259486937pnemc.pdfIn PDF document text
    • http://milanbeach.fun/water_parks_near_me_that_are_openshlup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408875/normal_5fed16187756b.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/aircraft_structures_2_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411944/normal_602a45a28c718.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425929/normal_5ff524d0c9ef7.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/94985045530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_6039e369bf833.pdfIn PDF document text
    • http://xxlmature.site/668490667491eofc.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/advanced_wastewater_treatment_technologies.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/6e6f7bb2-d059-4447-bc97-91eee2fd56a9/fifty_shades_of_grey_full_movie_free_download_mp4_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/114ea589-a299-40a0-ac6e-b37a34c5907c/qu_diferencia_hay_entre_educacin_fsica_y_el_deporte.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca37a5e-2fb3-46bc-aca0-3bc8525eab84/rv_fridge_not_working_on_ac_fan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a343e978-325f-4d17-850e-1abf78dab1be/jimigoxilejazakebig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d989ecdd-8c63-45eb-8c2a-714c5d0f96fa/fumejofutegedepisotewer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66058e44-0228-4d85-a93b-2491d50e5af3/kofekutobis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f35f7a-9c93-4b54-b435-6a420749e868/sobimotujalamasow.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/is_fl_studio_fruity_edition_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd50c3a9-aaa1-4fcd-ba6a-62dcb515f259/why_does_scheherazade_tell_stories_for_one_thousand_and_one_nights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c60f7a-bbb1-4352-9e2a-08ce02878a8c/thermodynamics_an_engineering_approach_solutions.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/44303313744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e90b2c-386f-453f-b33b-3dd64767d006/41275219093.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_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 5508 bytes
SHA-256: ae643240b114c2cc3d8566c424c9e072d5ff3062b4a07b02e7928be420d1de41
font_01_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 11668 bytes
SHA-256: 177f2dd054ee461bd0ac8590ffa57e41ed0133427afa35f1657c98bdfc409a81