Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9de7c6765da19f…

MALICIOUS

PDF

75.0 KB Created: 2021-03-26 15:25:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c4001f669323547781f1588db75edeb8 SHA-1: b23fc42f61f93c8e6fad0c2029cdf2f16ab79c76 SHA-256: dd9de7c6765da19f9823e040bd583f22e6e22f6d2f53e4dfa305fb7ad81c0602
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically `https://dafemum.ru/strik`. The document's structure and numerous links suggest it functions as a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dafemum.ru/strik?utm_term=can+eating+too+much+gluten+cause+gluten+intolerance In PDF document text
    • https://cdn.sqhk.co/zexoribuj/gBgefVk/zobebofiduwolipumisawigof.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/dTGfahf/free_full_length_comedy_movies_on_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/vp6ihjd/definicion_de_biotecnologia_vegetal.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/important_days_in_all_months_download.pdfIn PDF document text
    • http://keluzizizeroki.getenjoyment.net/introduction_to_mathematical_thinking_book.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/KKhicgh/hideo_kojima_twitter.pdfIn PDF document text
    • http://nebokamuwego.iblogger.org/remogikojeruveritow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb97807-baba-4aa7-9c8e-1690353c5642/14450890230.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_e5899f4d1a3f42c8a071a00a49bf4745.pdf?index=trueIn PDF document text
    • https://3a988cde-8684-4da7-9cc5-a1c078ef4475.filesusr.com/ugd/1f7474_a0a220eb55704be4a7a5a5e724e3af41.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8991cb-c908-42a9-ab7a-b48e7ba30560/why_appearance_is_important_in_south_korea.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/lagu_i_like_me_better_karaoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3471df3-4664-4bcf-8439-3d3d64b6779f/grounding_techniques_for_anxiety_youtube.pdfIn PDF document text
    • http://zevofelajasuz.epizy.com/mathswatch_clip_131_bearings_answers.pdfIn PDF document text
    • http://lejaxofin.epizy.com/kpsc._kar._nic._in_sda_key_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/lalipofeviganezozifudo.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_46aef778c0634b01a2e24e3f6f30878c.pdf?index=trueIn 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_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 5116 bytes
SHA-256: 5f9b4c3daf3efbce16c906943301cf44cb58ff3b7e266d139a3a6b55ca40945b
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 10952 bytes
SHA-256: 30e3804dcd01b3ebf2de30cacfa6a2e296d28c33047a7c84bee3c2408ed7edf6

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