Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4e9cb6863331aa…

MALICIOUS

PDF

70.5 KB Created: 2021-03-16 18:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 770298281cf536ddfb6e450edbb2cca4 SHA-1: 421d30241f663d2c61cfe184fb1b7783648d102a SHA-256: 0b4e9cb6863331aaa191ccd2d8588ebf4bcaf89a02e5b478585b6d8be9a19c8b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=evaluate+integrals+by+interpreting+in+terms+of+areas PDF link annotation
    • http://mihetos.xyz/html_tag_table_column_widtho7j0z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_601913c6e6d21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422392/normal_6044065eac1d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_6049811b42919.pdfIn PDF document text
    • http://namsinc.info/85989365200vywgl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_603c283591410.pdfIn PDF document text
    • http://idealica-it.website/201382243562wxk9.pdfIn PDF document text
    • http://erkutungotu.com/49887507086234ue.pdfIn PDF document text
    • http://lnstagramsecurity.net/burma_tv_731l62.pdfIn PDF document text
    • http://mosdendy.store/32596389784dn6vq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500453/normal_600d2ec82c8bc.pdfIn PDF document text
    • http://raifaisentgo.online/black_and_decker_60cm_corded_hedge_trimmerpff7v.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/8dc90a9c-5f8b-401c-a814-f24bfd8734bb/69555315623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea9cc33-a71a-43c9-b87e-d06409447de9/what_are_all_the_rappers_that_died_in_2020.pdfIn PDF document text
    • http://widamifikifewex.epizy.com/70451814658.pdfIn PDF document text
    • http://gutazerabudapa.epizy.com/xalozafumijoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1f281a-1fb5-4372-9415-af5b267193b6/franz_kafka_the_trial_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/hackintosh_zone_catalina_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/jiratuvoruteni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471a2e56-c543-4195-95f1-62dfad47498c/boruwoj.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/fijoxaluzaroxudukef.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_off0000c7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F4 5364 bytes
SHA-256: 80d8f9e032cbc5a66168da4a83e15f4d436d926df8255e1b7b15abe674e92269
font_01_sfnt_off0000da24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 10492 bytes
SHA-256: bac1191c4cac11237772a978bda6dbf593832319b27813338af448b015ac39cb
font_02_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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