Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d05d13c2cd46a7…

MALICIOUS

PDF

82.4 KB Created: 2021-03-27 23:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a244e2e4af6d0846e8366de846a20521 SHA-1: 96f565a6159f0543e3da0f27fbb289f6d2a42c41 SHA-256: a4d05d13c2cd46a77aaff3dbd0a943758ad7c79c82e30982d2f3b9d182b50602
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/award?keyword=cbse+class+9+syllabus+2020+20+pdf+download PDF link annotation
    • http://kujazudoxiro.22web.org/jusodudijenokabujatajim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/b647bdf8-9ace-4a6d-b65d-18f6614cb678/bomarowuxisazewafeliliz.pdfIn PDF document text
    • http://vawekud.epizy.com/lexot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc75cef-ec22-4ef0-b1a2-c09c212507da/when_would_you_use_inverted_commas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e073ec4-9dfc-4ed9-bc7c-d62e17069d18/92794956616.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/what_is_the_cost_of_arduino_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f436340-a1c1-4b03-9aaa-acd1598d8d63/96220077380.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/zotixuburisedavan.pdfIn PDF document text
    • http://vagelebab.rf.gd/tasegeponexusifozimizode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de950e1-8076-479b-be6a-a2ee0ce7a2d8/washington_dc_travel_restrictions_january_2021.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_5b5bc0ca82ae46f9868ee90877034f29.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_3f631cd1223a492591946d8b089f39b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jaloto/5306274255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b726cc9-64de-48a1-922a-9a8e2cbafd33/how_do_i_change_my_pc_ip_address_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/thomas_calculus_1_trke_indir.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_11a025b70f254b988daa9c27782c827a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/litunux/pebewokesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9eb03e-4dbb-46d6-8669-e4c7316ff735/what_does_the_quran_say_about_relationships_before_marriage.pdfIn PDF document text
    • http://lifafad.rf.gd/expressing_certainty_and_uncertainty_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/kadex.pdfIn PDF document text
    • http://bojakevu.epizy.com/my_simple_prayer_book.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_56b3d1bbce7142be876e5a1a342831a6.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 5724 bytes
SHA-256: b76dd25f0feb7b07177e87c16f3757c7212ca3e5ecb80ed08cb757184aad9d44
font_01_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 11204 bytes
SHA-256: 4ca7fd222d1ede36cd93c28f9525bdc32c3a8f9006a8b6871c991cda6e629f53
font_02_sfnt_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 4420 bytes
SHA-256: 22ea939fffb1cf5ce6eb4cb383af19aed0e46e98ec471f324efae2056563655f