Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75f44c2b1d04808…

MALICIOUS

PDF

84.3 KB Created: 2021-04-02 17:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 89053d9e58aaa1f9e5aa02e79df6b8a3 SHA-1: e4c1828ceac4733fcf7bfcf1d85a1c95e37aa8fb SHA-256: a75f44c2b1d04808522ecee9ed2572a95aedbd556c393132bdc96af87be48b14
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a primary suspicious URL identified as 'https://xezojetit.ru/award?keyword=blade+server+vs+rack+server+pdf'. Heuristics indicate the PDF is a link farm hosted on disposable domains, and ML classifiers strongly flag it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://xezojetit.ru/award?keyword=blade+server+vs+rack+server+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fd9d1dedc637.pdfIn PDF document text
    • http://raderojazoz.iblogger.org/the_accidental_prime_minister_book_online.pdfIn PDF document text
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/23934a19f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499300/normal_6032a3491803b.pdfIn PDF document text
    • http://kuvedodazi.22web.org/77622494754.pdfIn PDF document text
    • https://nalodewemutut.weebly.com/uploads/1/3/1/1/131164475/rupijum-timul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366947/normal_5fc93c0376566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478131/normal_6067238e7fb39.pdfIn PDF document text
    • http://delinapod.mypressonline.com/88181989454.pdfIn PDF document text
    • http://pupesotiv.22web.org/vinodawukadibotaxul.pdfIn PDF document text
    • https://vijotuwotula.weebly.com/uploads/1/3/0/7/130775401/cd2e214f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382961/normal_5ff7649ce80d2.pdfIn PDF document text
    • http://bupatinewesep.66ghz.com/elmer_elephant_ears_template.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/lixasifasi/tivojiwerek.pdfIn PDF document text
    • http://nebojemesiwi.atwebpages.com/38919671517.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/95690141757.pdfIn PDF document text
    • http://zezexef.epizy.com/the_wonder_weeks_app_price.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/direct_object_pronouns_spanish_practice_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/lovuzunotudodajatoma.pdfIn PDF document text
    • http://gonojutumuza.epizy.com/1141244883.pdfIn PDF document text
    • http://dowupozor.epizy.com/skin_arteriovenous_malformation_pathology.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/bronze_horseman.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_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 5324 bytes
SHA-256: 8fa3e1ebf3794fd6828abe0255fa432d4a0735b816c2ba886759b2ff39b30e49
font_01_sfnt_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 12268 bytes
SHA-256: a8a57ba99f566c5b0c686f5b2181ce40d8ac14a0a68fb2964a05314eb203a99e

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