Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4f114b3890a2f1…

MALICIOUS

PDF

75.5 KB Created: 2021-05-15 21:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ea7d031e031b32cba19642aa2a2f8f90 SHA-1: 987a3ed19119faa550d8a38b2c53f6341618def2 SHA-256: 9a4f114b3890a2f163a9eaf70e7d05ec3b31a42778606ea404d502ee8f38cf09
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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=can+mother+of+the+bride+wear+a+black+dress PDF link annotation
    • http://mosomupusafebin.medianewsonline.com/dulatafopufefivosawedunu.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/legal_affidavit_sample.pdfIn PDF document text
    • https://wudusalulolatus.weebly.com/uploads/1/3/1/6/131606476/ad6e86.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/3115582.pdfIn PDF document text
    • http://bagutoruramig.mywebcommunity.org/nikumitu.pdfIn PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/de7cf904eeb2b.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/jiaij9v/ball_screw_vs_lead_screw.pdfIn PDF document text
    • https://saremugofu.weebly.com/uploads/1/3/4/0/134017097/0f880424be65c.pdfIn PDF document text
    • https://solubowobadiwu.weebly.com/uploads/1/3/4/6/134642134/juvegel_katobuwu_kazewob_fulifipa.pdfIn PDF document text
    • http://kafidovomiguvo.mywebcommunity.org/uncle_tom_s_cabin_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/4jhsjfV/38899946073.pdfIn PDF document text
    • https://vegirizixe.weebly.com/uploads/1/3/4/7/134716682/921f504b.pdfIn PDF document text
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/kunobudado-xisokepe.pdfIn PDF document text
    • http://tediwaxivuj.sportsontheweb.net/handbook_of_local_anesthesia_6th_edition_download.pdfIn PDF document text
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/kebilutuwawa.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/jifedefujodu/vemesimekisimurukes.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/guidelines_for_401k_loans.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/answer_sheet_toeic_iig_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/komuzerikabolejipu.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/disable_spell_check_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/gapopodaxiderewiro.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/insectivorous_pitcher_plant_information.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_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 5460 bytes
SHA-256: 14bf15221470d9b5afcc2cb9de1bcc882734d4204395f8ece5be872f3aa6f50c
font_01_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 10444 bytes
SHA-256: 37d916a0ee73d306a2c4111447a921b19336755790983e68455c34de9626b11e

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