Malicious PDF — malware analysis report

Static analysis result for SHA-256 9daa598612c580af…

MALICIOUS

PDF

80.2 KB Created: 2021-03-04 01:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 754ec0ff4c4129f6675657d112700cd9 SHA-1: ba369867227b84cf8c027313b4575ce720739ed9 SHA-256: 9daa598612c580afd6c99ac0b7edfeebb48f23bb1f171a808224b3f9cb7f02e1
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a known malicious domain, yafferge.ru. The document body, though heavily obfuscated, suggests a lure related to scriptwriting to entice users to click the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely 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
  • 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://yafferge.ru/strik?utm_term=how+to+write+a+short+film+script+without+dialogue In PDF document text
    • http://sabuxaki.22web.org/definicion_entre_quimica_organica_e_inorganica.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/vavikadosakudorev.pdfIn PDF document text
    • https://mamumudud.weebly.com/uploads/1/3/0/8/130814078/2861576.pdfIn PDF document text
    • https://sijawakupud.weebly.com/uploads/1/3/0/7/130740213/2023615.pdfIn PDF document text
    • https://zopamege.weebly.com/uploads/1/3/5/9/135966764/rizipobo.pdfIn PDF document text
    • https://foworagajiwodim.weebly.com/uploads/1/3/0/9/130969946/d9f52f537558c.pdfIn PDF document text
    • http://tifalez.iblogger.org/volume_of_a_cylinder_worksheet_tes.pdfIn PDF document text
    • https://pepevifive.weebly.com/uploads/1/3/4/4/134480859/f15ce2aacdd.pdfIn PDF document text
    • http://gizaripe.iblogger.org/rixodidividizobupivazus.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/dumupa/badrinath_songs_mp4.pdfIn PDF document text
    • http://bobujosu.epizy.com/jomawexuwamawekuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/21871207723.pdfIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/suledilasesisera.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/aakasam_baddalaina_song.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/uppercase_alphabet_tracing_worksheets.pdfIn PDF document text
    • http://fakuzilezozo.epizy.com/knowledge_questions_and_answers.pdfIn PDF document text
    • http://jazifuz.epizy.com/paragraph_of_the_week_prompts.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_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 5624 bytes
SHA-256: 47c052b99ee28d26017b29cea9f5feb4a8910cb5a8a6d672fa4d1894a9ecc63b
font_01_sfnt_off00010186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 15664 bytes
SHA-256: 6ea3f59d13018e237a4f4fc7bbbd04193dd54218bf48c3c6e4439b1d8169c642

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