Malicious PDF — malware analysis report

Static analysis result for SHA-256 913e28c58605d16a…

MALICIOUS

PDF

77.5 KB Created: 2021-06-01 06:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 25778239f2bcd133762579b1903deae3 SHA-1: 0802c2890426a319ce8a30233c2ef9cb0bfc85b6 SHA-256: 913e28c58605d16a9e9da6ff3a5fd07fc656b77bc92c7181e439d1eb6786387c
186 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of these links and the overall structure point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://kuzutuzo.ru/123?utm_term=la+la+land+music+piano+sheet PDF link annotation
    • https://lemisisax.weebly.com/uploads/1/3/4/4/134494561/9233310.pdfIn PDF document text
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/7697083.pdfIn PDF document text
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/mupam-wepoka-xuxoxovenudu.pdfIn PDF document text
    • https://vejotawugupexo.weebly.com/uploads/1/3/4/7/134756202/nejuzurafotedej.pdfIn PDF document text
    • https://woxomeze.weebly.com/uploads/1/3/4/4/134498023/kikadipi.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/6774622.pdfIn PDF document text
    • https://jevizaja.weebly.com/uploads/1/3/4/8/134869407/01f699aa1f4e2.pdfIn PDF document text
    • https://bugekawimilu.weebly.com/uploads/1/3/4/5/134589579/leboba.pdfIn PDF document text
    • https://direfuxapiw.weebly.com/uploads/1/3/4/3/134371974/wamipen-bagopakafikiwe.pdfIn PDF document text
    • https://daletapobuwero.weebly.com/uploads/1/3/4/6/134666872/5550419.pdfIn PDF document text
    • https://bimuxafidiw.weebly.com/uploads/1/3/4/7/134701061/d4c76ecd14.pdfIn PDF document text
    • https://diwesosun.weebly.com/uploads/1/3/2/6/132695938/fawezama-gegagafipud-tamuz-pujitixiga.pdfIn PDF document text
    • https://puxefulido.weebly.com/uploads/1/3/1/3/131383426/lidatemese.pdfIn PDF document text
    • https://dosevabif.weebly.com/uploads/1/3/1/6/131637409/kifuvokudajoz_modagu_zibasozakadif_zukuvuwazat.pdfIn PDF document text
    • https://rusulurojexaka.weebly.com/uploads/1/3/0/8/130813489/2425b.pdfIn PDF document text
    • https://pejivepomut.weebly.com/uploads/1/3/5/3/135339444/rezivuvukesamapo.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/45bd03c7-ec57-4eb0-bc33-bb7e06906dcf/medewuxojovepoladizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df0310f0-666f-4115-b931-814cae898a73/4529422256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97ca3f6-1d5e-424c-af07-66a5d3d6e790/kedezepagelirakizotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e3d803-856d-47a8-963a-d52bd685cb46/xovopir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1be8d0-d52b-4546-8676-51b3b5308742/does_fasting_for_14_hours_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff37a28-13b7-4889-82cf-f7bdca6c2bd7/what_to_do_when_my_vape_says_check_atomizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c7e772-61c0-428d-b574-6909cd507d41/16186486173.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_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 5160 bytes
SHA-256: 06d4ef73f9c916f2cce2c39944a0a457e59008f682c56ea744125c702511391d
font_01_sfnt_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 11112 bytes
SHA-256: ce7adf027bf3107207f188ace789d4d35d6917134d1f09eb85929ded5427cc66