Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2acc890b76607fc…

MALICIOUS

PDF

83.9 KB Created: 2021-04-19 02:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec2c19f243b3a495a971491fd72e6e3e SHA-1: 5bfe8d8337d3a596006a36451816952c0e5c7684 SHA-256: e2acc890b76607fcd92ce45aee4a226b562ed3673f33972007e92bbebfc56335
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to PDF files, suggesting a link farm or content-scraping operation. The primary URL, https://jacksth.ru/strik?utm_term=naplex+review+questions+quizlet, is presented in a way that mimics a search result, likely to trick users into visiting a malicious or scam website. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=naplex+review+questions+quizlet
    • https://cdn.sqhk.co/merabuvi/haZjd5j/gumball_3000_net_worth.pdf
    • https://cdn.sqhk.co/tusenepobam/xiehieQ/ferazoxakivonimulu.pdf
    • https://cdn.sqhk.co/siwosisagi/Pjahaia/free_pets_and_skins_in_among_us_apk.pdf
    • https://cdn.sqhk.co/xuwifoviwalo/jdduiaA/rapido_luxo_campinas_campo_limpo_recarga.pdf
    • https://cdn.sqhk.co/vujenibolo/dkjfxY4/34114844459.pdf
    • https://cdn.sqhk.co/wabogoga/VZKWDib/30042025468.pdf
    • http://mugukix.mygamesonline.org/12788790238.pdf
    • https://cdn.sqhk.co/gutifusuf/QdhhgeA/cricket_wireless_login_problem.pdf
    • http://manovina.mypressonline.com/upsc_agriculture_optional.pdf
    • https://cdn.sqhk.co/guwaloxipete/jaajdha/yellowstone_kelly_rohrbach.pdf
    • https://cdn.sqhk.co/zopesakuz/jaieGhi/2019_honda_accord_sport_manual_2._0.pdf
    • http://gaxesujite.medianewsonline.com/envision_math_6th_grade_workbook_answers.pdf
    • https://cdn.sqhk.co/gapalagabig/fXoigxD/kendra_rpg_backpack.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jazuravazaguz/vofefiv.pdf
    • http://xufoziminep.onlinewebshop.net/34730886374.pdf
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_e46ff0756c2f4758b216c428bb7c6f9e.pdf?index=true
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_2b67850806a94d38b10406b918545230.pdf?index=true
    • https://s3.amazonaws.com/bopuxosavubare/48195801899.pdf
    • https://s3.amazonaws.com/bodajaku/fetudironubezibozofomeg.pdf
    • https://s3.amazonaws.com/satulibaren/hp_compaq_8000_elite_sff_pc_manual.pdf
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_ce78684d5b694232aa0e65593c135d79.pdf?index=true
    • https://s3.amazonaws.com/kujesulad/somidixupoduxub.pdf
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_4305a174a2d345d88f70e60fa920d759.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010753.bin
f15f66bc9dd018dcd533ae5e27a3c4f09dcf3599c354357b863af0566b36160d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 5180 bytes
font_01_sfnt_off00011927.bin
f78bf6c599e0c638e4b9757c8aafeb340f67c5dc2a07ac36ab8b90e8201d598f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 12100 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.