Malicious PDF — malware analysis report

Static analysis result for SHA-256 f948fd335601d403…

MALICIOUS

PDF

90.5 KB Created: 2021-01-12 13:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b0f644c75a6958461faf5948affb4382 SHA-1: 344722eb64de1c7b02178809facd8aff7163a807 SHA-256: f948fd335601d403827b55a1a8d6f224ad6801be73968faa51caf05af41feb61
204 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://gettraff.ru/aws?utm_term=definicion+de+cateter+venoso+central+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain references to this URL. The presence of multiple links and the ML classifier's high confidence score indicate a malicious intent, likely to direct users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gettraff.ru/aws?utm_term=definicion+de+cateter+venoso+central+pdf In PDF document text
    • https://cdn.sqhk.co/sixajuzap/gQkgiCe/jogatitudonefemiruviro.pdfIn PDF document text
    • https://site-1176222.mozfiles.com/files/1176222/gaduvubixot.pdfIn PDF document text
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/tezatebogujuna.pdfIn PDF document text
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/xujagalukovimozaxavu.pdfIn PDF document text
    • https://site-1168462.mozfiles.com/files/1168462/hello_neighbor_act_1_basement_xbox_one.pdfIn PDF document text
    • https://site-1168066.mozfiles.com/files/1168066/sidadetadalikeriruv.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/o17hfw1/multiple_accounts_on_alexa_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/jcAl8gi/walmart_money_card_activation_phone_number.pdfIn PDF document text
    • https://site-1171112.mozfiles.com/files/1171112/83717191995.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/vabevazunaxasu.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://s3.amazonaws.com/rodigapigeta/34831441343.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/application_not_installed_android_after_reboot.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/jedovekixamejuweja.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 1604 bytes
SHA-256: a90f79d35b855d6e419c922e1c16a7f20c875ed03b3e5f8d6d8c2638309ac592
font_01_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 4996 bytes
SHA-256: cbbf2f3b4ed108b332c8f35d1e7cd708233e2dd20d3f9960bf51e6bada5bd11a
font_02_sfnt_off000127a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A5 11756 bytes
SHA-256: daaec2696c031f261cf7faa0c07ddd7f58f17f13aab10f7ab326dc338c382525
font_03_sfnt_off00014d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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