Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b0663f5612ae21…

MALICIOUS

PDF

81.3 KB Created: 2021-04-05 18:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 75d96d29e3ee90db1b2fd27784524fb8 SHA-1: 1f94612c95130824a5c7ec89239afe0b40acdb1e SHA-256: b3b0663f5612ae21e9c443916cffcd6c87b68926d1eaa35c15e638fae8e58dd9
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings suggest the primary goal is to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=alcoholismo+pdf+2019 In PDF document text
    • http://helplnstagram-confirm.com/jusidaxaxufererjp01b.pdfIn PDF document text
    • http://usesoda.pro/play_life_online_with_friends_freej62xh.pdfIn PDF document text
    • http://varistop.site/netuludilajemegevasesi59eaf.pdfIn PDF document text
    • http://joblanc.xyz/enron_scandal_business_ethicsrchl9.pdfIn PDF document text
    • http://podarokinsta.site/hcf_and_lcm_using_venn_diagrams_worksheetvzutk.pdfIn PDF document text
    • http://tcerkovniekupola.space/the_endless_summer_movie_quotes515iv.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/bank_clerk_exam_study_material_free_download.pdfIn PDF document text
    • http://solapp.xyz/autocad_lt_free_trial_download62kdd.pdfIn PDF document text
    • http://watercart.ru/momujujevikueiu2.pdfIn PDF document text
    • http://salonly.xyz/59271111498ua2tu.pdfIn PDF document text
    • http://testersairf.xyz/82448448956lfys6.pdfIn PDF document text
    • http://wugegifa.getenjoyment.net/rig_veda_in_tamil_translation.pdfIn PDF document text
    • http://aazzzry.space/lalugimenefofapetamutiuew3.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/resixexi/mamebajewar.pdfIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_63b72c2cf0ac4ca1ab06c6c6fdc15531.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satulibaren/fimuxizirozad.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/itil_v3_foundations_certification.pdfIn PDF document text
    • http://mojogoralil.onlinewebshop.net/manibojufofexe.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/senivoxadinajefodido.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_6b94646267374cc89f3dd9aab7a96ddd.pdf?index=trueIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_077aadbaea7549f9ba4f2508a186c917.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_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 5560 bytes
SHA-256: 3d824bcd0b0e9fbe113d858729944db1b7c52ece59048de839c3b43f48a9b0f3
font_01_sfnt_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 12192 bytes
SHA-256: 83c7e7b253fa3cb98b868395ac390728422a4def30d1b18e905d381ede2dc891

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