Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c25052d1145c2b9…

MALICIOUS

PDF

91.0 KB Created: 2021-02-22 19:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b116a4606e87efe11484911aa296a64e SHA-1: 20b60e28d9895ca786528fe7523bcd62616df5bd SHA-256: 2c25052d1145c2b9b162148bd282dfe877bb7f2e9a57ced791f3efb06009912e
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://crophysi.ru/strik?utm_term=is+hybrid+car+expensive+to+maintain', are designed to redirect users to potentially harmful websites. The ML classifier and ClamAV detection further support the malicious nature of this file, indicating it is likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=is+hybrid+car+expensive+to+maintain In PDF document text
    • http://erethiztzj.space/what_is_exposition_in_plotsxi8h.pdfIn PDF document text
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/ruralulegoxaxoj.pdfIn PDF document text
    • http://medyayazilimtr.com/como_quitar_perspectiva_en_illustrator5158e.pdfIn PDF document text
    • http://nebo-baikala.ru/sexugonavimajulaponudcmmo.pdfIn PDF document text
    • http://juvozukatug.66ghz.com/65235252761.pdfIn PDF document text
    • http://itanah.space/benoviloguni7lm.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/8c066676a9ba.pdfIn PDF document text
    • http://itasummer.fun/what_is_a_nice_word_that_starts_with_the_letter_ho7dbi.pdfIn PDF document text
    • http://takipleskazan.org/is_the_stock_market_on_christmas_eveat1sw.pdfIn PDF document text
    • http://epipog.com/baputofawugezikekltgm5.pdfIn PDF document text
    • http://epipog.com/domupipabevixe37iuj.pdfIn PDF document text
    • http://stikc.xyz/possessive_pronoun_worksheet_for_grade_5y7aja.pdfIn PDF document text
    • http://burrrhey.tech/what_is_the_best_cryptocurrency_for_beginners9rz5u.pdfIn PDF document text
    • https://rajuwirorevub.weebly.com/uploads/1/3/5/3/135306937/4948982.pdfIn PDF document text
    • http://neyroskakalka.site/backflow_inspection_reportvm5u1.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajumapudetuji.rf.gd/rent_contract_template.pdfIn PDF document text
    • http://fufagarafe.epizy.com/nadobisoxux.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010dfe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10DFE 15584 bytes
SHA-256: df036ef62bcfa94109877739801bfa9b7855cf9a68d37c9f5a2405ab65a28f26
font_00_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 5588 bytes
SHA-256: 0bf2f2ea99895b67cae334430ac68cd451211116d8bc83243faad6298b691607
font_02_sfnt_off0001390a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390A 10892 bytes
SHA-256: d9d2ed7305f3ec147cc6ce4927109adb1d0027d4cd7eed1fc656f2c069cc3e52

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