Malicious PDF — malware analysis report

Static analysis result for SHA-256 8154d526a82afac0…

MALICIOUS

PDF

76.8 KB Created: 2021-03-16 03:12:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9d5550d4f196a7f1ec36a50608f98bcb SHA-1: 204f58714a2118be633bbbe2a746c214f8daa7ea SHA-256: 8154d526a82afac091b76682a20ee18c4526f0320b627825c598faa5f2e1e32a
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The document body, though partially obfuscated, contains a title related to English grammar, likely a lure to disguise the malicious intent. The presence of numerous external URIs and the ML classifier's high confidence score indicate a strong likelihood of malicious activity, potentially leading to further compromise via the linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=ejemplos+de+verbos+regulares+en+pasado+simple+en+ingles PDF link annotation
    • http://mikovil.mywebcommunity.org/kiswahili_phonetics_and_phonology.pdfIn PDF document text
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/fixavaruja.pdfIn PDF document text
    • https://xixebume.weebly.com/uploads/1/3/0/9/130969831/lidemotubu-kiverikoxobuzo-jaxutute.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/weekly_work_schedule.pdfIn PDF document text
    • https://tabawowap.weebly.com/uploads/1/3/4/5/134599755/zudugixi.pdfIn PDF document text
    • https://tisudarolajese.weebly.com/uploads/1/3/0/8/130813738/tamogoniputu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_60470d1c2a5ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479254/normal_6011d9c6951e2.pdfIn PDF document text
    • http://kitixukizogutik.mygamesonline.org/encyclopedia_of_ancient_greek_language_and_linguistics.pdfIn PDF document text
    • http://xafegadixugu.iblogger.org/5864425717.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/ledapovujetora.pdfIn PDF document text
    • http://legivupipofu.66ghz.com/medevejovabul.pdfIn PDF document text
    • http://takafebuxoz.22web.org/fesisu.pdfIn PDF document text
    • http://zipibewivuxe.22web.org/betiwegiwibisonuwexutu.pdfIn PDF document text
    • https://kutowovazamil.weebly.com/uploads/1/3/4/3/134362820/nowijilepubirofozut.pdfIn PDF document text
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/lagigedasigejuvamuvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muzulozak.atwebpages.com/24200458893.pdfIn PDF document text
    • http://pirafabitibabik.rf.gd/the_7_bridges_of_konigsberg_answer.pdfIn PDF document text
    • http://nitusul.rf.gd/vipukavosodelexo.pdfIn PDF document text
    • http://dikawixum.epizy.com/66001783371.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/how_long_is_romeo_and_juliet_book.pdfIn PDF document text
    • http://pabadebaluke.rf.gd/time_complexity_of_algorithms_cheat_sheet.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_off0000e9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 5512 bytes
SHA-256: 26587f36ca903b5ae62dd7c903da3f7293d2afb118be5cb3a3f1ffff8a16cd39
font_01_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 12164 bytes
SHA-256: 66e11bff38250904342a6fc7684aaac2bcbd4107acf40c02dee5c9cc9067120a