Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9988c04b5f6a8f…

MALICIOUS

PDF

78.0 KB Created: 2021-04-04 20:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8b503a11816e273120aac69c389342b SHA-1: 749f28e77e9f0b2f5de784cc4ed2d9927284587b SHA-256: ca9988c04b5f6a8f600db367900a17b965379201d57a652157debe0e8cf7cf8a
214 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL 'https://yafferge.ru/aws'. The document's content, though partially obfuscated, appears to be a lure related to a common desktop issue, aiming to trick users into clicking the malicious link. The presence of numerous external PDF links and the ML classifier's high confidence score indicate a malicious intent to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=why+is+my+desktop+not+showing+any+icons
    • https://cdn-cms.f-static.net/uploads/4458389/normal_5feaef60eb75c.pdf
    • https://static.s123-cdn-static.com/uploads/4469626/normal_5ff82a1856c43.pdf
    • https://static.s123-cdn-static.com/uploads/4370302/normal_5ff34c6a55f0b.pdf
    • https://cdn-cms.f-static.net/uploads/4419433/normal_60191e6cc85b3.pdf
    • https://cdn-cms.f-static.net/uploads/4413719/normal_6056d81378b3c.pdf
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5ffbd1e9e47a0.pdf
    • https://static.s123-cdn-static.com/uploads/4452587/normal_6001c7afbf8ab.pdf
    • https://cdn-cms.f-static.net/uploads/4466659/normal_606820af6f5f6.pdf
    • https://cdn-cms.f-static.net/uploads/4365998/normal_60357b1d9f655.pdf
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5fe9ee5997d97.pdf
    • https://cdn-cms.f-static.net/uploads/4375073/normal_6057bb015cc36.pdf
    • https://static.s123-cdn-static.com/uploads/4480402/normal_6004cd35c054e.pdf
    • https://cdn-cms.f-static.net/uploads/4466391/normal_5fe8956e90742.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vukenebavez.rf.gd/ntse_2018_sat_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/d000ae7c-f194-47d1-9002-86a61303bbd2/2014_chevy_malibu_led_tail_lights.pdf
    • https://uploads.strikinglycdn.com/files/321b4e03-b0a3-4de2-8cb5-85c9bc365660/tebebilob.pdf
    • https://ba5d4ca7-777b-4ff7-855d-60fc8da7b8b2.filesusr.com/ugd/29a726_457621f060fd4945b6d137e556554ffb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ccf5fd82-e23e-4379-a5a6-8d5ddaadd827/reloading_kit_for_beginners_price.pdf
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_ca3556ed2d1a410dbb5b437d07559a76.pdf?index=true
    • https://uploads.strikinglycdn.com/files/643940f1-a997-4c9b-8671-982e808ead1d/which_statements_below_are_true_regarding_permanent_and_temporary_accounts_check_all_that_apply.pdf
    • http://katawezinir.rf.gd/tivexalonojifolaris.pdf
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_246ad5e94c3b433eb0b5a07f81be5854.pdf?index=true
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_0e23bafe8c9440d8990fae06b72a153e.pdf?index=true
    • http://kufilabed.epizy.com/interview_questions_for_c_and_c_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/8dd85327-2b8a-4bb9-aa3d-b8bd1c8ea288/what_is_the_setting_of_the_story_pamato.pdf
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_743e9c232e5e4c37adf993ec605108ed.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f126.bin
06f7154da36ba55d2e14442f5f725eda0e3912854613209dcef1ddb2349358b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 5628 bytes
font_01_sfnt_off0001044e.bin
d99d22263fed451d9bf000c4ef3e83447df223c3b8887d51ab851d4fa21a93eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 10940 bytes

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