Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9aa274e16f965e…

MALICIOUS

PDF

83.4 KB Created: 2021-02-20 03:02:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7cee2b4e744a6605f0143b46dd4da98e SHA-1: 46eaeaefbb177e547f66add9ad188b1b79dcee46 SHA-256: 1d9aa274e16f965e710472f02be0c8712a5a44f6965cca19f614395820bdb631
154 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple heuristics, including a critical finding for a malicious redirector link. The embedded URL points to 'yafferge.ru', which is known malicious infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a PDF document about religion, likely intended to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=the+sacred+and+the+profane+the+nature+of+religion+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4482870/normal_601ac59d2b526.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391620/normal_5fe03ab7360ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417029/normal_602ac6da2b58f.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/gozhiib/digestive_system_labeled_and_functions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528876/normal_5fda8d24c8aba.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/jcjbqgy/influenced_by_the_platform_of_minor_parties.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_6016e38eb32d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5ff0eed9dafd8.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/gageihs/ates_ve_su_5_element_oyun_skor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_602fea911b770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_600ff05de7e42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_602fd190702e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5ff7be968ede2.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/vapelurowar/postman_6._7._4.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/excel_2010_bedingte_formatierung_ganze_zeile_einfrben.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/revufopopifatejumesa.pdfIn PDF document text
    • http://ribezewipuzez.epizy.com/chuyeenr_file_sang_word.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/51927676071.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_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 5368 bytes
SHA-256: 5f1c49b5bd3bfac9a91989d77532ba04464afa0cf6a4ee4b0085a1d5c1b5f498
font_01_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 10244 bytes
SHA-256: 7a2c3f70987ec0ab6ad50414ddc4982c4a40f5379585a09dbe59879e13e0e8e0

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