Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e1ab799537614e…

MALICIOUS

PDF

155.2 KB Created: 2021-03-22 21:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9581ea6155fdb1be0625944210a7157d SHA-1: 2a1315bc7ef323b01e2a25e84bd7e2eadbb0368d SHA-256: 17e1ab799537614e10308a318b8fde48c1626c53392b24d4db9f6480f6551dd9
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a phishing attempt by ClamAV and ML classifiers. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm designed to direct users to potentially malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://xajibur.ru/award?keyword=maths+functions+formulas+pdf PDF link annotation
    • http://dream-stat.ru/lightning_link_android_cheats0cho5.pdfIn PDF document text
    • http://manovina.mypressonline.com/fodez.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/how_to_reply_an_email_for_thank_you.pdfIn PDF document text
    • http://shopsupergood.site/toyota_camry_se_2017_oil_filter086lk.pdfIn PDF document text
    • http://dajexori.mypressonline.com/korozetedox.pdfIn PDF document text
    • http://geesecam.com/17797953717ixnt.pdfIn PDF document text
    • http://chestlune.online/esl_conversation_questions_for_beginner_adults43n35.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/99d40f25-f05e-4f7f-9bab-73c5e50b11a8/30988835597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/923cac87-2698-4cc7-a487-67459404f105/how_to_pass_medical_assistant_exam.pdfIn PDF document text
    • http://pimusozulub.epizy.com/39218983358.pdfIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_a93f5634410948058f6775a6e9f424ad.pdf?index=trueIn PDF document text
    • http://sinusisokopex.atwebpages.com/thumb_isometric_exercises.pdfIn PDF document text
    • http://serefelotu.epizy.com/92627064999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d05343c1-4a69-4453-9f66-da239e1ab80f/lukipoke.pdfIn PDF document text
    • http://dulubuli.rf.gd/what_courses_do_you_need_to_become_a_real_estate_agent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c3b672-445b-43e7-990f-aaecf4d272c8/dosusixemolapuvi.pdfIn PDF document text
    • https://0f3c41ac-de96-4ba7-a517-026d7435d592.filesusr.com/ugd/8631de_63eaea6a23f04bac8fd587955c2c3a0c.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E385 6512 bytes
SHA-256: d8f974cc658f66e44451d4bac5854e0bab25443cdb295f0f949c81ab1358e479
font_01_sfnt_off0001f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F397 5164 bytes
SHA-256: 4e9ec29ceb3c8da021da5e9f67e944efd1b501ac2ed6dcbb7a3eb2aaf2f273e3
font_02_sfnt_off000204e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204E4 14536 bytes
SHA-256: bee25fd0f4fa99dac1be0ea0970d731906726c218588eed924ecb21f93fd2094
font_03_sfnt_off000235bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x235BB 17400 bytes
SHA-256: d1408ec754f4a3e6b00fcb082f27eaad2bf38a92cc63cfb159361ea8e822a1c4
font_04_sfnt_off00024fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24FD2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c