Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f2d98f76d0c8e7…

MALICIOUS

PDF

76.3 KB Created: 2021-03-01 16:00:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c1f9e61b05f04bdeba8bcbf7ae3a8454 SHA-1: 04491b87619ceeaa4ea0664d3958075a37381189 SHA-256: 37f2d98f76d0c8e74a562776683fff339e6ae7c0f6f136baef15e352ecb9ccd9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with a prominent one being 'https://pelibifir.ru/aws?utm_term=how+do+you+reset+a+ge+dehumidifier', suggesting a lure to a potentially malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for multiple links, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/aws?utm_term=how+do+you+reset+a+ge+dehumidifier PDF link annotation
    • http://soul-felt.com/bogufubumipafevegim28w06.pdfIn PDF document text
    • http://rfs.team/1290021943lqwoy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473445/normal_6007cd68df1ac.pdfIn PDF document text
    • http://logekolumo.22web.org/lafebev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415530/normal_60046be68eb0b.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/super_mario_sunshine_walkthrough_part_2.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/77202942802.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/how_to_calculate_bank_loan_interest_per_annum.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/zowikasus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500883/normal_5fe191dc58c10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_5fd32994abee1.pdfIn PDF document text
    • http://astropsychology.website/modo_de_produccion_asiatico_clases_socialesrcu3b.pdfIn PDF document text
    • http://persequenteamsohbet.com/physique_chimie_1re_s_hachette_2015qpq4i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dibulokesimerog.rf.gd/42383685349.pdfIn PDF document text
    • http://feworoborisadej.epizy.com/47414563836.pdfIn PDF document text
    • http://savefativiluz.epizy.com/48762650439.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 5220 bytes
SHA-256: fb3077cecf30c4b3bf0f235e6735378d048bb036fcadc06ddc07045594314782
font_01_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 10752 bytes
SHA-256: 0b8437ec787f8b836ca515f42ecc9dd3f6aa929a12fc06dc7bbae3cad2895ba4
font_02_sfnt_off000115e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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