Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2c8cd83d3a1ae8…

MALICIOUS

PDF

76.1 KB Created: 2021-04-02 05:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5050bbd6ba18399bda012dd17ba5b4c1 SHA-1: f40905ee8f4d30aa916921d8051450ead4cc2088 SHA-256: 5b2c8cd83d3a1ae827b9cdb301e01545f0f305f500bb1cb84fc60454878ec0ea
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous external URLs, with one suspicious URL pointing to 'nipisod.ru'. The document's structure and the presence of many external links suggest it is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=la+revolucion+mexicana+puerto+rico PDF link annotation
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/komunitewodoriz-tutevanebesum-sesonugib-roxurubijijiz.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/7ff41937f918a28.pdfIn PDF document text
    • http://xuxodowenam.getenjoyment.net/31002494197.pdfIn PDF document text
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/zibuxuba-nugomurosi-felakegide.pdfIn PDF document text
    • https://dewixazupeteti.weebly.com/uploads/1/3/1/4/131455636/kisunijefis_denufufomobalap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_3daa064f674f44d9aa37b528f25be68a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6030d354-f4f2-4f36-99bf-0049f04b5872/artemis_fowl_eternity_code_graphic_novel.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_16f1e5cb401341c99f2ca7a9ead9248a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/ladim.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_235214fdb2d9483c94bab46f202e7026.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71eaff13-2f65-4af7-a2b3-76ef414e93c6/7954320735.pdfIn PDF document text
    • https://7162416e-a815-4e2e-b4b4-2f1b6d3d7a1b.filesusr.com/ugd/0723a7_934f0c7d9faa4b1382a56a036c671b49.pdf?index=trueIn PDF document text
    • http://xiwozoget.atwebpages.com/what_does_od_mean_in_medical_terms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bca6a20-196b-4dac-9d46-2ac94add4888/91709310648.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/27540427092.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/66610209353.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_b828a870f1aa4f3988d0fc5e971cdda2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3acb97b9-81a1-4f89-8109-c23ba56907f7/thrawn_comic_book_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93767360-8d08-44c3-af33-6436dd0f612f/purinas_y_pirimidinas_anillos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57430aaf-3a48-491e-94a1-98ab60590078/marine_vhf_frequencies_south_africa.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_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 4972 bytes
SHA-256: bba85e3e6f5d9b7341cd4f1b283aafa79d6ff559040b2d339a6463bb52eade3e
font_01_sfnt_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 12052 bytes
SHA-256: 9c7f395bb8ccf912e6c9e13534b21333ce6ea1194903afb8d149127252102101