Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7f448eb6b867a9…

MALICIOUS

PDF

80.5 KB Created: 2021-03-20 02:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f0e9f28c364b4845a276782ad1ba1e19 SHA-1: 6b2507de34d6231663e0bbf91c943124c0830eea SHA-256: ac7f448eb6b867a9ea3192209787d033f4aba824477ed401a2006c2361613719
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing operations. The presence of external URIs and a link farm heuristic points to an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=august+2017+algebra+1+regents+part+2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375093/normal_5ff9741e063e3.pdfIn PDF document text
    • http://zemimumaloger.iblogger.org/9482841372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_5fd921dc9d800.pdfIn PDF document text
    • http://futajef.medianewsonline.com/73rd_amendment_act.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/tukewiponibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_6015029654cdf.pdfIn PDF document text
    • http://vojirumabi.22web.org/what_is_the_hardest_calculus_problem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rovututuxopi.epizy.com/usmle_genetics_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db93867-535e-4f2e-bb1c-71b64c74baee/45252035374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b91eb1-8f73-47fd-990f-91765c6baffa/what_is_a_letter_of_intent_to_purchase_real_estate.pdfIn PDF document text
    • http://pasibujaz.epizy.com/are_human_body_cells_haploid_or_diploid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8e6634-f7cd-4841-95f7-4370a14963cb/fepikilipeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95dc9aee-2ce8-45b7-bcf8-29686f43ca1a/how_do_you_reset_a_rca_voyager_tablet.pdfIn PDF document text
    • http://jusarim.epizy.com/ba_4sem_date_sheet_2019_kuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fca3b00-da59-432e-8b50-2501a6d2ae10/can_you_renew_your_permit_after_it_expires.pdfIn PDF document text
    • http://wetoxikilosawa.epizy.com/he_comes_next_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a75b0c-0723-48ca-9691-1f1a64ac41f7/47880168874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322d5143-c927-41a9-98c1-8a58b84a2ccd/garmin_nuvi_2597lmt_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12289142-fd4e-4ae7-bec7-0d8e41a203c7/13032883510.pdfIn PDF document text
    • http://begosene.epizy.com/guided_reading_activity_year_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f508a568-c523-49cd-b9a5-d5c9ad26ea81/wugafixibagonomovilil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76687e5c-ea61-49d6-af2c-a4fbc2e99a3c/beveliweximiliwajunobeka.pdfIn PDF document text
    • http://rukinozo.epizy.com/bribery_act_sri_lanka_sinhala.pdfIn PDF document text
    • http://welididoseburiv.epizy.com/42871651463.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_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 5520 bytes
SHA-256: 0e1bc6a033c2eabe1bd2fb7ec742696bd1b4a5adb7df492c5fdf979dcf5fd6a0
font_01_sfnt_off00010b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B18 11512 bytes
SHA-256: 1ef2926432c80068358a27240c470cfa7e73226deec5cba6c769ff0250737cbe