Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c260d2879c7cb7…

MALICIOUS

PDF

86.0 KB Created: 2021-05-14 22:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 757c39af3c53fb855229cbeab523aa5e SHA-1: 0b795b5aa97901ea089ece2065e531117c10698d SHA-256: 23c260d2879c7cb7ededb4d64c2dc2987171c668ac73ab432a1b3a0554236f7d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL that redirects to a link farm, suggesting a phishing or malicious content delivery attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a search query, likely intended to drive traffic to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=does+charcoal+get+rid+of+blackheads PDF link annotation
    • https://cdn.sqhk.co/gupuwiwi/ibgdSgd/future_wives_in_million_girl.pdfIn PDF document text
    • http://sojafefewozuxub.iblogger.org/lurunotesematimuwemigowe.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/42712918094.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/93240427847.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/39997891613.pdfIn PDF document text
    • https://cdn.sqhk.co/nunexijezep/igcgegg/pocket_league_soccer_2_mod_apk.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/york_centrifugal_chiller.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvotalek/fiiC5UZ/collating_excel_sheets.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/article_about_music.pdfIn PDF document text
    • https://cdn.sqhk.co/piwizogir/IIFifjb/public_health_reports_ontario.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/ipOiihg/geopolymer_concrete_ppt.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/zumezeviwakiz/napidokafed.pdfIn PDF document text
    • http://kobebosafuraw.rf.gd/moon_phases_worksheet_for_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c475434b-76fe-483a-93a8-49c2f325f792/un_mundo_feliz_aldous_huxley_en_ingles.pdfIn PDF document text
    • http://wolidile.rf.gd/how_much_is_supply_chain_management_course.pdfIn PDF document text
    • http://pudosuvosav.atwebpages.com/biogas_plant_design_calculations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5147fc-e00c-4734-a3c6-4791fd9b203d/what_is_a_visual_representation_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/fukedilopujag.pdfIn PDF document text
    • http://dizojid.rf.gd/59283053957.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/85860850957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64bebad9-02f7-4387-8840-9eccec7f4aff/36493262836.pdfIn PDF document text
    • http://muluwokixo.onlinewebshop.net/bukokazanujumugexuge.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/proform_235_csx_recumbent_exercise_bike_reviews.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_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 5484 bytes
SHA-256: 428d6c1fb8a5664ba6b2e1d747d6541eb3b9d7c79a9678727783b838d1ec7a55
font_01_sfnt_off0001232e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232E 11420 bytes
SHA-256: 5f3ee299a61d62839117f0adb8c625332df6880a2f70c929c05623e0c2600c1d

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