Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b790d0cb5f61d8e…

MALICIOUS

PDF

74.5 KB Created: 2021-04-03 21:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6b418c1cae4d1be6e18f7ebca70fb886 SHA-1: 05a66219de18363ed267899d6ee38bbe936aec56 SHA-256: 4b790d0cb5f61d8e38290f53aa46070958f4530b00dbcb532e34a5c3e11ae748
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to other PDF documents. The primary URL, 'https://soxebez.ru/wix?keyword=rhubarb+anna+jones', suggests a potential attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/wix?keyword=rhubarb+anna+jones PDF link annotation
    • https://zosonokabawim.weebly.com/uploads/1/3/4/3/134316026/7565386.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/8569b.pdfIn PDF document text
    • http://pepirizibizedel.22web.org/brother_printer_driver_dcp-_t510w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/97118b33-20a2-485b-b5ce-5ec6e4ba3590/how_to_avoid_falling_in_love_with_a_jerk_ebook.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_d5836496081f4635a370c4bfd1c0eb61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1461817-117d-4a7f-820d-ae8398c1d922/71673142518.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/cross_bridge_formation_between_actin_and_myosin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfb08d8-6c86-478b-985f-79a92dada337/why_is_my_led_security_light_not_working.pdfIn PDF document text
    • http://sozofini.epizy.com/zipevaxafagogog.pdfIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_cc4cab77cf214cbe99c9796f06090400.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/041e2eed-9808-49dd-a672-dc9ad337938d/comcast_xfinity_cozi_tv_channel.pdfIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_59f55e31e1f748a6b2743dc5d1237c5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26266121-0b03-451d-bec5-8296cb10e638/8.1_similarity_in_right_triangles_worksheet_answer_key.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_daebc4bdcce9469fb7cbe7248606e1b2.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_32affdd998fc43289f7282025bd42711.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/netinuwa/mozovanimosazituwu.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/confluence_macros_in_templates.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_4f57c9df77c944f1b7a3fa9478896afb.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_e3c97a3ef6e64973b828739d89313cf8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 4964 bytes
SHA-256: 0088ef236df26c454d0b7609f789f17e8867c2626ea9b5e564854ebdfb0322a2
font_01_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 10748 bytes
SHA-256: 38377a615a46f514dc42b1f1582036901eff69062f8c36ebcf6b2119dc055774