Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b27fcce91c5246c…

MALICIOUS

PDF

69.4 KB Created: 2021-03-23 10:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04f76275fd10d1f02308ca8e69bcfd17 SHA-1: 5ee99748025ca8f1beb4e75e96ccd8361ce2e485 SHA-256: 1b27fcce91c5246c8ab86a115188767091e1a28f6a9a24caea920ade6a4c6499
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a significant portion pointing to disposable domains, suggesting it functions as a link farm. The presence of external URIs and the PDF's structure strongly suggest it is used to redirect users to malicious websites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=nyan+cat+ninja+10+hours PDF link annotation
    • http://stroymarketmetal.ru/pewuwogitetavufilinadigivdx2j0.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/54398a.pdfIn PDF document text
    • http://bakijimape.22web.org/tulitiverofarosufovezosi.pdfIn PDF document text
    • http://shmelev.pro/zoxomp3cy3.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/all_the_bright_places_movie_rated_r.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/balance_of_trade_of_pakistan.pdfIn PDF document text
    • http://shortsomfj.space/panofumulesur5x3j.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/advantages_and_disadvantages_of_islamic_banking.pdfIn PDF document text
    • http://instapriz.website/nizeguzonopovilewofojas4iqdv.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/stable_ischemic_heart_disease_guidelines_2020.pdfIn PDF document text
    • https://kafunisizu.weebly.com/uploads/1/3/4/5/134599740/5118758.pdfIn PDF document text
    • http://miwodenexiz.iblogger.org/sample_interview_answers_what_are_your_strengths.pdfIn PDF document text
    • https://fafetomipisiso.weebly.com/uploads/1/3/4/6/134603542/bobexuvalugije.pdfIn PDF document text
    • http://domobifotuza.sportsontheweb.net/ncc_c_certificate_exam_syllabus.pdfIn PDF document text
    • http://zumedemuruva.22web.org/character_development_sheet_deviantart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/89889e30-61f2-4246-9bab-c833c029dea1/gepijiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c274749e-7b93-4d9d-b4db-0dc6273d41b3/how_to_reset_descale_on_breville_espresso_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899c09d4-d58e-4d2b-a1ab-523861198eb6/ti_84_plus_c.pdfIn PDF document text
    • http://tifilow.onlinewebshop.net/30460386505.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_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 5196 bytes
SHA-256: 9e9ae19a3779cdbeb129c6a5d8ec8df7e550c0295a860dfb66580d87b5e9bc17
font_01_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 10348 bytes
SHA-256: 37b3f53954dc78e80df0e61b684f3559c263e48481d21f0ebe2cc10982c5cc0d

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