Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a015430f76b50c2…

MALICIOUS

PDF

126.4 KB Created: 2021-03-24 19:07:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f8aeacc433e5db9fe6c4e34cd2dbded4 SHA-1: 56374d7b2de08b8d23314cb22d88c8f891245286 SHA-256: 0a015430f76b50c284cd06fa75c384d3f9aadbd1dcd74b43e79b5737d39a61cf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=bram+stoker+s+dracula+screenplay+pdf PDF link annotation
    • https://fulariduzumi.weebly.com/uploads/1/3/0/7/130775737/fb46cd1614e63.pdfIn PDF document text
    • http://nipamaton.22web.org/855279503.pdfIn PDF document text
    • http://mewudaguzexo.sportsontheweb.net/kelemiduf.pdfIn PDF document text
    • https://jotovaxawunujej.weebly.com/uploads/1/3/1/8/131856347/6820357.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/gozapo.pdfIn PDF document text
    • http://vitrinachel.ru/one_of_the_most_intelligent_dog_breedsxa32o.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/world_history_textbook_online_10th_grade_glossary.pdfIn PDF document text
    • https://rebuxikaxaj.weebly.com/uploads/1/3/4/6/134668288/39276895c1c40.pdfIn PDF document text
    • http://triple-doska5.club/the_snake_vs_block_addictive_gamesmjb6x.pdfIn PDF document text
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/9687178.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/91e11cf6-31ad-4c5f-9db1-dea77cf80f90/56482861384.pdfIn PDF document text
    • http://degejukifukux.epizy.com/bengali_dictionary_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13f7db1-3711-490f-a5bf-fe5df01376a7/bavudafuwufefuxe.pdfIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_e7a2fd47ab9742faa6ec5a1c5948b970.pdf?index=trueIn PDF document text
    • http://fogovulosuzan.onlinewebshop.net/72268083745.pdfIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_8c9cc4a14d57454a8bb26d3076324c32.pdf?index=trueIn PDF document text
    • http://xefukogan.rf.gd/enduring_power_of_attorney_template_western_australia.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_bd2f04abbbdb4198bd4a5cc99fffdaed.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_off0001b5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5C9 5516 bytes
SHA-256: 94354b30389b555b4467fe7bfd8230523728f1107388173311820c719f30b7c4
font_01_sfnt_off0001c883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C883 10468 bytes
SHA-256: 948e97321cac8fc54ed20c855d0df16a3a0a0a4f33b3af1ca201101be5682d58

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