Malicious PDF — malware analysis report

Static analysis result for SHA-256 20481baaf55fa2cb…

MALICIOUS

PDF

74.3 KB Created: 2021-04-08 09:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3423656667c27a6b71b9bd2cd21e31d9 SHA-1: 9cae3076fe5140ddc433d5b1afecf80fc731e156 SHA-256: 20481baaf55fa2cbaa070ca31d3c41d28710aef2765287166dd826b1ca8fad06
156 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 0.9993

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 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.
  • 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://golowaki.ru/wix?keyword=cadet+reference+manual PDF link annotation
    • http://sajitalunaded.22web.org/xedusunulip.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/tOghuij/rocketbook_wave_standard_smart_notebook_with_pen_station.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452837/normal_5fdcefb6d3f05.pdfIn PDF document text
    • http://xesifavaner.22web.org/kirugivalipanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499005/normal_603b679d358ca.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/ijlhhhh/bearded_butchers_pig.pdfIn PDF document text
    • https://cdn.sqhk.co/guzufaseba/hibibDt/8_ball_pool_hack_tool_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/iejij8T/22378056555.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/OlDiggd/roblox_piano_sheets_waltz_in_a_minor.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/LzUsiit/science_project_solar_system_working_model.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5fe8ec7cb519f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417830/normal_5fe1a0f5cdaf8.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/ihihvgd/kiwomadamafegikexewaw.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/vezumobigodub/business_management_certificate_online_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/xodasanutow.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/xebamurap.pdfIn PDF document text
    • http://jujewejono.epizy.com/english_to_bengali_dictionary_offline.pdfIn PDF document text
    • http://malinaliwul.epizy.com/mathematics_for_machine_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/niwanopisanuwasoroju.pdfIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_1ac1834cce9e487b816e8cbbb49c8fbe.pdf?index=trueIn PDF document text
    • http://jimatupobosubu.rf.gd/ralezopejufogixukegeto.pdfIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_547652061de540bd83d5b6f46d50b4cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remufuzu/22725391141.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_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 4896 bytes
SHA-256: 6204c62d3ae777ef7ccc51ccaa1b85eafe2bff039945925b000c81b86714a199
font_01_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 10904 bytes
SHA-256: c55cc6ef53de18303e52a7bab1d9796d2b69bbd65bebed7777f36f3c52e76980

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