Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a3009b01131dfc…

MALICIOUS

PDF

81.1 KB Created: 2021-04-05 18:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: da26d19858ada2334d6771c5b5c316da SHA-1: 5eac2c8962c449ff798c43477da57c05d1154cdc SHA-256: 19a3009b01131dfcea87b7b6eecc38ae00d6e40f1c6c46948dd4b12e53b853db
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a mass of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, https://leonvi.ru/wix?keyword=jimmy+the+birdman+smith+boxer+now, appears to be a lure for further malicious activity.

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
  • 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.
  • 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=jimmy+the+birdman+smith+boxer+now PDF link annotation
    • https://cdn.sqhk.co/xumirikebixo/hhaggjg/80_r_b_music_playlist_download.pdfIn PDF document text
    • http://pubgmobiie.com/which_of_the_following_is_an_example_of_a_database_management_system_a_person_searching_the_electraz985q.pdfIn PDF document text
    • https://cdn.sqhk.co/sarokuneti/dLuZ9Hr/90s_tv_show_quiz_questions_uk.pdfIn PDF document text
    • http://segwaywheelchair.ru/703124194255utjb.pdfIn PDF document text
    • http://interbank.link/4758969482dvqz5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_e2c088914169432d81d74d358de4d4cf.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_10ec846ea49e4e98abc5b085b42677ad.pdf?index=trueIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_27425fe3d09e44dba00c53c7eaa253ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ede6c88-8994-4cb5-a5af-d0471f137c59/what_size_belt_for_cub_cadet_ltx_1040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3adac9b-f8f8-4c0f-a874-9c0c12760a76/how_many_electrons_are_in_the_4d_orbitals_of_tc.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_462f2fdd28e14cbc8338dcb45dd9c87b.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_77619cce4bac4f8998da87e21e81c3d2.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_4fda0f494f4348f6bb566912f5a78a02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b801659-f7d2-455e-ab3f-ac8811039331/new_riders_of_the_purple_sage_song_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c43a76-4d3c-4605-b6dd-99bd231d8cb8/27118533607.pdfIn PDF document text
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_ad4a0282e3aa49ee9e7dbd2dea4f1cad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4349470e-8d9b-4195-812e-7f9b9553168a/estructura_del_texto_narrativo.pdfIn PDF document text
    • https://99ca13e2-8bf0-45b2-93fa-bbfb519f101f.filesusr.com/ugd/5392be_a845a295e4c944a0bf69439cdad8767a.pdf?index=trueIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_7ec13dbbe91f4618897ed96622ecf948.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54ad698-94f8-4790-9632-27ae32d01738/polirusorodalegatawile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4779360a-150e-4da1-a292-519617ce73fe/pride_and_prejudice_and_zombies_film_review.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 5424 bytes
SHA-256: 8ffbfa4ea25f1ef5055e32eab4249cb8971dafda07605e5fca4c4317d3a2f4a5
font_01_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 11032 bytes
SHA-256: 3a2eeb1a4dcbe5813eba6b91e3e111ffc82bdc5997b9f42b1715eb040b867c46

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