Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33165a4437e9b37…

MALICIOUS

PDF

105.5 KB Created: 2021-03-04 22:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5b77cef3456b9a20fbe57863bf8aee08 SHA-1: 03780c75565cd1f152c0ba7357f6439a8bdf759b SHA-256: e33165a4437e9b373bd4a18e024e7108993b582d1fc4d8fad70f0bb72c93d746
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The PDF structure and the nature of the URLs suggest an attempt to lure users into downloading further malicious files or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=del+norte+county+scanner+feed PDF link annotation
    • http://mapotilij.mygamesonline.org/tidoba.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/mewagaduvelikar.pdfIn PDF document text
    • http://laulu-go.ru/marathi_inspirational_quotes_on_life_challenges2pd84.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/luwizogita.pdfIn PDF document text
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/7941639.pdfIn PDF document text
    • http://digovin.getenjoyment.net/the_power_broker_book_summary.pdfIn PDF document text
    • http://boothattendant.com/532024708388j8nr.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/the_power_of_doing_less_download_free.pdfIn PDF document text
    • https://winuvepesedop.weebly.com/uploads/1/3/4/4/134476249/77b87fbb8db3.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/ditor.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/good_things_come_to_those_who_wait_on_the_lord_bible_verse.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/1758742.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/how_to_get_rid_of_benzoic_acid.pdfIn PDF document text
    • http://optamorem.com/4439140071654awc.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/76877482775.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/is_sql_still_useful.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_95ca48ca3f9042fab506528d60a3dfa5.pdf?index=trueIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_55824f730dec484ea703598a44b80395.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_c48205b38841402eb720c7f666f147cd.pdf?index=trueIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/sample_behavioral_interview_questions_and_answers_for_managers.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
    • 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 6864 bytes
SHA-256: 57dfb7fad957257da553e1d1a4979cd792fb7641df1823fd660c87212833acfc
font_01_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 5116 bytes
SHA-256: 4d610f2bb0e967b6d6c6685be3069193ebb704772546faa0819125e54c994786
font_02_sfnt_off000123cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 6268 bytes
SHA-256: ecfd522552e56c7006c54c3deec1295e9fea2485f7cf5b970956a6fa84274501
font_03_sfnt_off00013300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13300 1768 bytes
SHA-256: 71e3b280feb8750c03182d211e5d86a38ccaf433260d42eaa87e17f117f63f21
font_04_sfnt_off00013bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC6 16468 bytes
SHA-256: 94044d862df694a674b40d2c26d8ad9be8f63413cd1b8e64f74f06a23496b521
font_05_sfnt_off00016eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EAF 16520 bytes
SHA-256: d2ed6d637242e9a991f4291178e9af904ff0f6a083ca078f2d8164ac0e74d1f0
font_06_sfnt_off00018547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18547 6580 bytes
SHA-256: 542ca6d3a5822ad2db498722191d20577dbaf76512d731a6110f6333316eb9c2

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