Malicious PDF — malware analysis report

Static analysis result for SHA-256 735a23bf0bf4f1e9…

MALICIOUS

PDF

71.9 KB Created: 2021-02-25 08:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 10214e797a9b9463dcb6943298922c86 SHA-1: 88b78a5828864a03f05b0c4688707ea12a080a0b SHA-256: 735a23bf0bf4f1e93be8b90245081e95a7cbfac18348215f278eee452fe32805
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=blink+book+pdf+in+hindi'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier and ClamAV also flagged this file as malicious, reinforcing the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=blink+book+pdf+in+hindi In PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fc5831012a88.pdfIn PDF document text
    • https://kojelokawuzu.weebly.com/uploads/1/3/4/3/134341929/3286924.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494889/normal_5ffcc36f334e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_6024842c9ca8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496170/normal_5fec295b69624.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/kakogapavagoniwolebunanen.pdfIn PDF document text
    • https://paxazojip.weebly.com/uploads/1/3/0/8/130873894/1686096d44dbd.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/xomudufe/yosemite_private_tour_guide.pdfIn PDF document text
    • http://tijepexaran.epizy.com/93356407022.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/polaris_280_parts_wall_fitting.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/best_english_books_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/17090423715.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/what_is_popular_culture_google_scholar.pdfIn PDF document text
    • http://balesalefune.epizy.com/katuwewe.pdfIn PDF document text
    • http://tigefaxoweta.rf.gd/jaxolunurifesalu.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/carvel_pistachio_ice_cream_ingredients.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/kadiwoxapabodumut.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/tilarovuxo.pdfIn PDF document text
    • http://sekizipax.rf.gd/25542230579.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/fell_down_the_rabbit_hole_meaning.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/how_to_repair_auger_on_pellet_stove.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_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 4896 bytes
SHA-256: 5e63230b7342e04fa70b6a56f9342c2dc458248e5be2ec2babd26ff60193c5b0
font_01_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 11208 bytes
SHA-256: 2d12fbc4c96d0130367ab276e1b7eb071fcf904d973485ae6c899b0324072357

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