Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b50f17e1a017fc3…

MALICIOUS

PDF

98.8 KB Created: 2021-03-21 07:12:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 98a0805106b23d0231d583d00f47e25a SHA-1: 270ab4499e75c68d95a060b32c61684b4ea35d0b SHA-256: 5b50f17e1a017fc3452c31884a3c82afa6bc2a2a2859061e4ba0ad738e06d798
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The embedded URLs and the heuristic findings point towards a tactic of using a document to funnel users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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 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://resalured.ru/wix?keyword=ccna+wireless+study+guide+pdf+free+download PDF link annotation
    • https://wabumixa.weebly.com/uploads/1/3/4/5/134585451/jimelega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_601005508864d.pdfIn PDF document text
    • http://crysety.xyz/tajweed_rules_malayalamiq5a3.pdfIn PDF document text
    • https://dujapiloxi.weebly.com/uploads/1/3/1/8/131857305/ccac8765a6923.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/jaxisevi_tozefiguwel_gupepitozule.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/jwCjgAC/vivo_dual_computer_monitor_desk_mount_stand_vertical.pdfIn PDF document text
    • http://koprovk.xyz/wabuntqvcw.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/jfhejaT/zozilokemokapidoloronifo.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunabem/AicgfcR/1256380892.pdfIn PDF document text
    • https://nasoxuxelaleve.weebly.com/uploads/1/3/4/7/134744481/7951702.pdfIn PDF document text
    • https://tagudosalanuku.weebly.com/uploads/1/3/1/4/131452811/fibivonusapuziwak.pdfIn PDF document text
    • http://alcexpress1.xyz/42592759511zegdo.pdfIn PDF document text
    • https://cdn.sqhk.co/nepelusir/kTgffZP/airbnb_los_angeles_neighborhood_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/rovevexapag/gcYs5ge/91559958145.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/what_are_marketing_strategy_process.pdfIn PDF document text
    • http://fruktovik.com/tiwapatemadozonibugakujuxubd90.pdfIn PDF document text
    • https://cdn.sqhk.co/bogonelemid/hia8jgY/bobasifipejarale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_601e865d61c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385848/normal_604d98f17ff58.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/cjb1hea/36251884520.pdfIn PDF document text
    • http://zebisol.mypressonline.com/sumbangan_kerajaan_bani_abbasiyah.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/how_to_change_nc_license_plate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366639/normal_5fee17ed8bcda.pdfIn PDF document text
    • http://levelupguild.com/poloturibemopijufukofunieobv.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CeW8Yie/rimidozilitimonofitiga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/89072705721.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_off0001454d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454D 5424 bytes
SHA-256: 33e2835d38fc5aa0c8186ca0376051a0f4c28863dbd23c59764a062bc385a642
font_01_sfnt_off000157e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E6 10964 bytes
SHA-256: d06c5eea7ee76e3654dec21b970bad2f879c5070a2886b0b25b61d7d5b972cf6