Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5228913bac43af…

MALICIOUS

PDF

76.2 KB Created: 2021-03-09 08:24:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2d5d2d9ffcd53b469d617387294ca7ed SHA-1: d4161d51fdb536b5d187bdb4a467dccb83d2631e SHA-256: 9d5228913bac43af3c94671fda5993113ee6e5b1acadcb35a9bb3fc0d0a85980
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various websites, with a notable heuristic indicating a mass external PDF link farm. The primary purpose appears to be directing users to potentially harmful content or for SEO manipulation, rather than delivering a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=which+is+the+best+oil+filled+room+heater+in+india PDF link annotation
    • https://kopaluzakiletal.weebly.com/uploads/1/3/0/7/130739322/4be9495bf3.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/android_development_for_beginners_free.pdfIn PDF document text
    • http://logoped-samara.ru/mufujewewigedatumijlvxf.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/air_force_ones_high_top_womens.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/71755721624.pdfIn PDF document text
    • http://circleshtang.xyz/why_is_my_dryer_not_drying_properlyiwi4x.pdfIn PDF document text
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/pitoduzagowojewu.pdfIn PDF document text
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/xijutagalejepa.pdfIn PDF document text
    • http://rekugegik.scienceontheweb.net/critical_theory_sociology.pdfIn PDF document text
    • https://xukusoresi.weebly.com/uploads/1/3/4/4/134488105/sawotuzeg.pdfIn PDF document text
    • https://wakaxizuso.weebly.com/uploads/1/3/5/3/135322555/jipatimu.pdfIn PDF document text
    • http://ninuwekevap.scienceontheweb.net/p_b_shelley_ode_to_the_west_wind.pdfIn PDF document text
    • https://jodajapiguzok.weebly.com/uploads/1/3/2/7/132710756/133751.pdfIn PDF document text
    • http://businessmentality.com/vegetarian_cookbook_free_downloadopxsu.pdfIn PDF document text
    • http://ludshop.xyz/dslr_camera_ios_app_freev7z8z.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/9089085.pdfIn PDF document text
    • https://badetujunomut.weebly.com/uploads/1/3/1/8/131857650/012c4b4b6.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/dokurubukiropesubovo.pdfIn PDF document text
    • http://raisinsapp.club/niroxufonivodoxixebqw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suduxegowur.onlinewebshop.net/jefafibiwofojizafadaj.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_c07b18186252422caa69006d4f257f7c.pdf?index=trueIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/pdf_to_dwg_converter_free_download_trial_version.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_1d31d88c4d374d93aa46133177db8d21.pdf?index=trueIn PDF document text
    • http://gurabagoderes.atwebpages.com/ruzitojevevobowima.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_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 5416 bytes
SHA-256: c6fd8a862731987a49bdbd608ba123ce36835761ea668c677534a93a2543aa0a
font_01_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 11044 bytes
SHA-256: b989f6799890ddaac79ca71a494c3bc0407dfde1d2defd8be2341c10307868eb