Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fff542d855cec86…

MALICIOUS

PDF

73.0 KB Created: 2021-05-18 04:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ba916d4b9c5e1a7266694b0e47eddcbc SHA-1: b1985488b6dd8a65a7593917a1ab993af01a6412 SHA-256: 8fff542d855cec861ab4bf5822251f3ce4547653034ec8cae11f71ea3e97dc20
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=new+navy+type+3+uniform+regulations PDF link annotation
    • https://gojodisob.weebly.com/uploads/1/3/4/6/134664442/daxovofozelowi_jimatonaboxifa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454807/normal_5fffcf59957d4.pdfIn PDF document text
    • http://fopuval.22web.org/35432852160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_60109d0bd91f3.pdfIn PDF document text
    • https://temadugebunexi.weebly.com/uploads/1/3/1/8/131871621/06f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446499/normal_606944681e26c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411944/normal_605f919357b4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_60076f100ace9.pdfIn PDF document text
    • https://xabomipa.weebly.com/uploads/1/3/4/4/134484571/jirefid-lagog.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/fujadabez/gagofasudasakijinituvetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af8fa7e-7940-448f-82bd-16aec637a3b9/on_cooking_6th_edition_chapter_1.pdfIn PDF document text
    • http://ligumawi.epizy.com/ap_reorganisation_act_2020_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/watojovopanirigusenego.pdfIn PDF document text
    • http://vedezaduxi.epizy.com/arban_trumpet_method_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a12796-e3c2-4ce3-b936-116e9d9a032a/wigelosasiresot.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/33434769929.pdfIn PDF document text
    • http://zasadawizeloz.epizy.com/47638528922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bf9b20e-03cb-4555-be04-6104fac8b018/mumujolipak.pdfIn PDF document text
    • http://poxizaxo.epizy.com/43217315179.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_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 5608 bytes
SHA-256: 574050f2b4d656e56a286b27d08319bb92eb3115bddba06a50ce6e0b91fd952a
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 11092 bytes
SHA-256: 0c6717bde7aef0f18c315f485bfb215650d95c11cc03095ddcb9609464a72daa

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