Malicious PDF — malware analysis report

Static analysis result for SHA-256 b380664b713f1e89…

MALICIOUS

PDF

83.1 KB Created: 2021-04-23 03:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 634068099031fc30c734c4ebf4a0af54 SHA-1: 8ddd37c38627088eee80b357101615c2eb258219 SHA-256: b380664b713f1e897090767ae26340f983b8dab59f9170b1c82a0fa7ef265a73
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=alexander+the+great+movie+ultimate+cut PDF link annotation
    • http://sokfresh.fun/fepakopelexidipukitesnn2v1.pdfIn PDF document text
    • https://cdn.sqhk.co/worijekegir/eHieLkG/bastar_university_private_exam_form_2019.pdfIn PDF document text
    • http://onlajn-kassa.ru/mukewizuymp5q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_601346053ea41.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/how_to_use_nitecore_charger.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/why_is_twilight_not_on_netflix_anymore.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/fifty_shades_of_gray_filma_24.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/kenmore_he2_plus_clean_drain_pumpzt4hm.pdfIn PDF document text
    • http://s7hmus.org/apk_badoo_chattkdei.pdfIn PDF document text
    • http://steelsho1.club/big_data_hadoop_book52vf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406501/normal_60248ab496771.pdfIn PDF document text
    • http://tokio-2020.fun/nogarozuxuvumo79rhj.pdfIn PDF document text
    • http://voiprormul.xyz/23736415665g3skb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500200/normal_606a95eb4e7e1.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/07tmptZ/sandeep_maheshwari_news.pdfIn PDF document text
    • http://tiktoktop.design/apple_tv_3rd_generation_jailbreak_appsm87s2.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/Vjjjhmf/digital_tasbeeh_counter_online_pakistan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b005a386-5061-4cbe-a0be-630e4f954207/what_are_the_elements_of_gothic_architecture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532740ce-f5d3-4ea9-949f-42042d8bd25d/58558993809.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 5172 bytes
SHA-256: 385d1a73bf4e35f0243329f29664080d5013f06d9d3b5e57fbd5676685f5af1a
font_01_sfnt_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 11172 bytes
SHA-256: a1d8b9ac2e96080a41b5d8ec79c10d2649ecab1634a069f0980931235378d1cf
font_02_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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