Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e099b708396c83a…

MALICIOUS

PDF

78.0 KB Created: 2021-03-25 10:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 627c9ef384c5d6e09c02d0a73478d80f SHA-1: 754aba447841f659f078d5ab7af53d2e420f9e27 SHA-256: 3e099b708396c83a6519ac7a9b97e9213e656b4326b6d17aa51321246dd137a9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute various files. The presence of a 'download' lure further supports the malicious intent. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/award?keyword=thinking+in+java+4th+edition+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/fudopalizew/ieghRib/53619249584.pdfIn PDF document text
    • https://dinidoleto.weebly.com/uploads/1/3/0/9/130969871/61fccab4e59d48d.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/M7GxOie/46264804821.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/hgj7hej/crack_sat_reading.pdfIn PDF document text
    • http://bolipoloweda.mygamesonline.org/97094042513.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzudumijamo/Byifzgi/4k_forest_wallpaper_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwikiw/2DDNkjb/74915674382.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/7jhigeq/88040455892.pdfIn PDF document text
    • https://jaloteke.weebly.com/uploads/1/3/4/0/134096083/piwigeji.pdfIn PDF document text
    • https://cdn.sqhk.co/suwaxixadut/FjcRgfg/only_human_piano_sheet_music_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/BP2Q7hf/45095952472.pdfIn PDF document text
    • https://cdn.sqhk.co/wodigajamu/hh9jdgj/42986641344.pdfIn PDF document text
    • https://suneminus.weebly.com/uploads/1/3/4/5/134529318/zenoxoruvateti_diginudem_zesogipados_gupuv.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/midumipojexojixili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/pexezunusamowag.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/pre_admission_form_du_2019.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/cima_fundamentals_of_financial_accounting.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/best_animated_movies_of_all_time.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/75985565101.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/when_should_i_use_a_water_flosser.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/how_to_do_z_table.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/how_to_treat_dogs_for_mange.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/nerisekuferujapida.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_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 5452 bytes
SHA-256: 57e58df05225ab8ef5e19a4f7948838507288aaa641d9fd7d780a18e3e835fb3
font_01_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 10816 bytes
SHA-256: e3b1e123575ed69943f5bda3843d44746f5f786eb8871b89c144f41c282ecf01